在按钮上拖动 TextView - 应用程序崩溃
Drag TextView on Button - App crashes
我是 Android 编程的新手，现在我想了解有关拖放操作的更多信息。所以我的目标是将 TextView 拖到自定义按钮上，当我放下它时，TextView 的文本应该替换按钮的文本。
为此，我创建了一个扩展 Button:
的 "DropTargetView"
public class DropTargetView extends Button implements View.OnDragListener{
private boolean mDropped;
public CharSequence name;
public DropTargetView(Context context) {
super(context);
init();
}
public DropTargetView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public DropTargetView(Context context, AttributeSet attrs, int defaultStyle) {
super(context, attrs, defaultStyle);
init();
}
private void init(){
setOnDragListener(this);
}
@Override
public boolean onDrag(View v, DragEvent event) {
PropertyValuesHolder pvhX, pvhY;
switch (event.getAction()){
case DragEvent.ACTION_DRAG_STARTED:
pvhX = PropertyValuesHolder.ofFloat("scaleX", 0.5f);
pvhY = PropertyValuesHolder.ofFloat("scaleY", 0.5f);
ObjectAnimator.ofPropertyValuesHolder(this,pvhX,pvhY).start();
mDropped = false;
break;
case DragEvent.ACTION_DRAG_ENDED:
pvhX = PropertyValuesHolder.ofFloat("scaleX", 1f);
pvhY = PropertyValuesHolder.ofFloat("scaleY", 1f);
ObjectAnimator.ofPropertyValuesHolder(this,pvhX,pvhY).start();
break;
case DragEvent.ACTION_DRAG_ENTERED:
pvhX = PropertyValuesHolder.ofFloat("scaleX", 0.75f);
pvhY = PropertyValuesHolder.ofFloat("scaleY", 0.75f);
ObjectAnimator.ofPropertyValuesHolder(this,pvhX,pvhY).start();
break;
case DragEvent.ACTION_DRAG_EXITED:
pvhX = PropertyValuesHolder.ofFloat("scaleX",0.5f);
pvhY = PropertyValuesHolder.ofFloat("scaleY", 0.5f);
ObjectAnimator.ofPropertyValuesHolder(this,pvhX,pvhY).start();
break;
case DragEvent.ACTION_DROP:
Keyframe frame0 = Keyframe.ofFloat(0f, 0.75f);
Keyframe frame1 = Keyframe.ofFloat(0.5f, 0f);
Keyframe frame2 = Keyframe.ofFloat(1f, 0.75f);
pvhX = PropertyValuesHolder.ofKeyframe("scaleX", frame0, frame1, frame2);
pvhY = PropertyValuesHolder.ofKeyframe("scaleY", frame0, frame1, frame2);
ObjectAnimator.ofPropertyValuesHolder(this, pvhX, pvhY).start();
name = (CharSequence) event.getLocalState();
setText(name);
mDropped = true;
break;
default:
return false;
}
return true;
}
}
然后我将这些按钮和我的 TextView 放在我的 XML-File 中：
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="60dp"
android:id="@+id/tableLayout"
android:clickable="false"
android:theme="@android:style/DeviceDefault.Light.ButtonBar.AlertDialog">
<TableRow>
<com.example.scuba.dragdrop.DropTargetView
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn1"
android:layout_margin="15dp"
android:text="1"
/>
<com.example.scuba.dragdrop.DropTargetView
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
android:id="@+id/btn2"
android:layout_margin="15dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="10"
android:id="@+id/Tv"
android:layout_below="@+id/tableLayout"
android:layout_centerHorizontal="true"
android:layout_marginTop="77dp" />
我通过长按 TextView 开始拖动操作：
public class WriteDigital extends AppCompatActivity implements View.OnLongClickListener {
public CharSequence value;
TextView Tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_write_digital);
Tv = (TextView) findViewById(R.id.Tv);
Tv.setOnLongClickListener(this);
value = Tv.getText();
}
@Override
public boolean onLongClick(View v) {
DragShadowBuilder shadowBuilder = new DragShadowBuilder(v);
v.startDrag(null,shadowBuilder,value,0);
return false;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_write_digital, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
所以当我开始拖动时，一切都很好并且动画效果很好。但是，一旦我将 TextView 拖到 Button 上，应用 crashes.I 就会出现很多错误。有人说String不能在spannable中转换??
另外我想知道使用剪辑数据而不是本地状态来传递文本信息是否更好，我该如何做到这一点？
希望有人能帮忙。
这是我在 logcat 中的错误：
08-21 08:38:15.770 27274-27274/com.example.scuba.arduinoremote E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.scuba.arduinoremote, PID: 27274
java.lang.ClassCastException: java.lang.String cannot be cast to android.text.Spannable
at android.widget.TextView.onDragEvent(TextView.java:8767)
at android.view.View.dispatchDragEvent(View.java:17401)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewRootImpl.handleDragEvent(ViewRootImpl.java:5026)
at android.view.ViewRootImpl.access0(ViewRootImpl.java:96)
at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:3213)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5061)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:610)
at dalvik.system.NativeStart.main(Native Method)
package com.vijay.dragdrop;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.os.IBinder;
import android.os.Vibrator;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import java.util.ArrayList;
public class DragController
{
private static final String TAG = "DragController";
/** Indicates the drag is a move. */
public static int DRAG_ACTION_MOVE = 0;
/** Indicates the drag is a copy. */
public static int DRAG_ACTION_COPY = 1;
private static final int VIBRATE_DURATION = 35;
private static final boolean PROFILE_DRAWING_DURING_DRAG = false;
private Context mContext;
private Vibrator mVibrator;
private Rect mRectTemp = new Rect();
private final int[] mCoordinatesTemp = new int[2];
/** Whether or not we're dragging. */
private boolean mDragging;
/** X coordinate of the down event. */
private float mMotionDownX;
/** Y coordinate of the down event. */
private float mMotionDownY;
/** Info about the screen for clamping. */
private DisplayMetrics mDisplayMetrics = new DisplayMetrics();
/** Original view that is being dragged. */
private View mOriginator;
/** X offset from the upper-left corner of the cell to where we touched. */
private float mTouchOffsetX;
/** Y offset from the upper-left corner of the cell to where we touched. */
private float mTouchOffsetY;
/** Where the drag originated */
private DragSource mDragSource;
/** The data associated with the object being dragged */
private Object mDragInfo;
/** The view that moves around while you drag. */
private DragView mDragView;
/** Who can receive drop events */
private ArrayList<DropTarget> mDropTargets = new ArrayList<DropTarget>();
private DragListener mListener;
/** The window token used as the parent for the DragView. */
private IBinder mWindowToken;
private View mMoveTarget;
private DropTarget mLastDropTarget;
private InputMethodManager mInputMethodManager;
interface DragListener
{
void onDragStart(DragSource source, Object info, int dragAction);
void onDragEnd();
}
public DragController(Context context)
{
mContext = context;
mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
}
public void startDrag(View v, DragSource source, Object dragInfo, int dragAction)
{
boolean doDrag = source.allowDrag();
if (!doDrag)
return;
mOriginator = v;
Bitmap b = getViewBitmap(v);
if (b == null)
{
return;
}
int[] loc = mCoordinatesTemp;
v.getLocationOnScreen(loc);
int screenX = loc[0];
int screenY = loc[1];
startDrag(b, screenX, screenY, 0, 0, b.getWidth(), b.getHeight(), source, dragInfo, dragAction);
b.recycle();
if (dragAction == DRAG_ACTION_MOVE)
{
v.setVisibility(View.GONE);
}
}
public void startDrag(Bitmap b, int screenX, int screenY, int textureLeft, int textureTop, int textureWidth, int textureHeight, DragSource source, Object dragInfo, int dragAction)
{
if (PROFILE_DRAWING_DURING_DRAG)
{
android.os.Debug.startMethodTracing("Launcher");
}
if (mInputMethodManager == null)
{
mInputMethodManager = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
}
mInputMethodManager.hideSoftInputFromWindow(mWindowToken, 0);
if (mListener != null)
{
mListener.onDragStart(source, dragInfo, dragAction);
}
int registrationX = ((int) mMotionDownX) - screenX;
int registrationY = ((int) mMotionDownY) - screenY;
mTouchOffsetX = mMotionDownX - screenX;
mTouchOffsetY = mMotionDownY - screenY;
mDragging = true;
mDragSource = source;
mDragInfo = dragInfo;
mVibrator.vibrate(VIBRATE_DURATION);
DragView dragView = mDragView = new DragView(mContext, b, registrationX, registrationY, textureLeft, textureTop, textureWidth, textureHeight);
dragView.show(mWindowToken, (int) mMotionDownX, (int) mMotionDownY);
}
private Bitmap getViewBitmap(View v)
{
v.clearFocus();
v.setPressed(false);
boolean willNotCache = v.willNotCacheDrawing();
v.setWillNotCacheDrawing(false);
int color = v.getDrawingCacheBackgroundColor();
v.setDrawingCacheBackgroundColor(0);
if (color != 0)
{
v.destroyDrawingCache();
}
v.buildDrawingCache();
Bitmap cacheBitmap = v.getDrawingCache();
if (cacheBitmap == null)
{
Log.e(TAG, "failed getViewBitmap(" + v + ")", new RuntimeException());
return null;
}
Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
v.destroyDrawingCache();
v.setWillNotCacheDrawing(willNotCache);
v.setDrawingCacheBackgroundColor(color);
return bitmap;
}
public boolean dispatchKeyEvent(KeyEvent event)
{
return mDragging;
}
public void cancelDrag()
{
endDrag();
}
private void endDrag()
{
if (mDragging)
{
mDragging = false;
if (mOriginator != null)
{
mOriginator.setVisibility(View.VISIBLE);
}
if (mListener != null)
{
mListener.onDragEnd();
}
if (mDragView != null)
{
mDragView.remove();
mDragView = null;
}
}
}
public boolean onInterceptTouchEvent(MotionEvent ev)
{
final int action = ev.getAction();
if (action == MotionEvent.ACTION_DOWN)
{
recordScreenSize();
}
final int screenX = clamp((int) ev.getRawX(), 0, mDisplayMetrics.widthPixels);
final int screenY = clamp((int) ev.getRawY(), 0, mDisplayMetrics.heightPixels);
switch (action)
{
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_DOWN:
mMotionDownX = screenX;
mMotionDownY = screenY;
mLastDropTarget = null;
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if (mDragging)
{
drop(screenX, screenY);
}
endDrag();
break;
}
return mDragging;
}
void setMoveTarget(View view)
{
mMoveTarget = view;
}
public boolean dispatchUnhandledMove(View focused, int direction)
{
return mMoveTarget != null && mMoveTarget.dispatchUnhandledMove(focused, direction);
}
public boolean onTouchEvent(MotionEvent ev)
{
if (!mDragging)
{
return false;
}
final int action = ev.getAction();
final int screenX = clamp((int) ev.getRawX(), 0, mDisplayMetrics.widthPixels);
final int screenY = clamp((int) ev.getRawY(), 0, mDisplayMetrics.heightPixels);
switch (action)
{
case MotionEvent.ACTION_DOWN:
mMotionDownX = screenX;
mMotionDownY = screenY;
break;
case MotionEvent.ACTION_MOVE:
mDragView.move((int) ev.getRawX(), (int) ev.getRawY());
final int[] coordinates = mCoordinatesTemp;
DropTarget dropTarget = findDropTarget(screenX, screenY, coordinates);
if (dropTarget != null)
{
if (mLastDropTarget == dropTarget)
{
dropTarget.onDragOver(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
}
else
{
if (mLastDropTarget != null)
{
mLastDropTarget.onDragExit(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
}
dropTarget.onDragEnter(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
}
}
else
{
if (mLastDropTarget != null)
{
mLastDropTarget.onDragExit(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
}
}
mLastDropTarget = dropTarget;
break;
case MotionEvent.ACTION_UP:
if (mDragging)
{
drop(screenX, screenY);
}
endDrag();
break;
case MotionEvent.ACTION_CANCEL:
cancelDrag();
}
return true;
}
private boolean drop(float x, float y)
{
final int[] coordinates = mCoordinatesTemp;
DropTarget dropTarget = findDropTarget((int) x, (int) y, coordinates);
if (dropTarget != null)
{
dropTarget.onDragExit(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
if (dropTarget.acceptDrop(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo))
{
dropTarget.onDrop(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
mDragSource.onDropCompleted((View) dropTarget, true);
return true;
}
else
{
mDragSource.onDropCompleted((View) dropTarget, false);
return true;
}
}
return false;
}
private DropTarget findDropTarget(int x, int y, int[] dropCoordinates)
{
final Rect r = mRectTemp;
final ArrayList<DropTarget> dropTargets = mDropTargets;
final int count = dropTargets.size();
for (int i = count - 1; i >= 0; i--)
{
final DropTarget target = dropTargets.get(i);
target.getHitRect(r);
target.getLocationOnScreen(dropCoordinates);
r.offset(dropCoordinates[0] - target.getLeft(), dropCoordinates[1] - target.getTop());
if (r.contains(x, y))
{
dropCoordinates[0] = x - dropCoordinates[0];
dropCoordinates[1] = y - dropCoordinates[1];
return target;
}
}
return null;
}
private void recordScreenSize()
{
((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(mDisplayMetrics);
}
private static int clamp(int val, int min, int max)
{
if (val < min)
{
return min;
}
else if (val >= max)
{
return max - 1;
}
else
{
return val;
}
}
public void setWindowToken(IBinder token)
{
mWindowToken = token;
}
public void setDragListener(DragListener l)
{
mListener = l;
}
public void removeDragListener(DragListener l)
{
mListener = null;
}
public void addDropTarget(DropTarget target)
{
mDropTargets.add(target);
}
public void removeDropTarget(DropTarget target)
{
mDropTargets.remove(target);
}
}
您似乎使用了错误的 setText()
覆盖方法
您的代码应如下所示
setText(name, TextView.BufferType.SPANNABLE);
我是 Android 编程的新手，现在我想了解有关拖放操作的更多信息。所以我的目标是将 TextView 拖到自定义按钮上，当我放下它时，TextView 的文本应该替换按钮的文本。 为此，我创建了一个扩展 Button:
的 "DropTargetView"public class DropTargetView extends Button implements View.OnDragListener{
private boolean mDropped;
public CharSequence name;
public DropTargetView(Context context) {
super(context);
init();
}
public DropTargetView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public DropTargetView(Context context, AttributeSet attrs, int defaultStyle) {
super(context, attrs, defaultStyle);
init();
}
private void init(){
setOnDragListener(this);
}
@Override
public boolean onDrag(View v, DragEvent event) {
PropertyValuesHolder pvhX, pvhY;
switch (event.getAction()){
case DragEvent.ACTION_DRAG_STARTED:
pvhX = PropertyValuesHolder.ofFloat("scaleX", 0.5f);
pvhY = PropertyValuesHolder.ofFloat("scaleY", 0.5f);
ObjectAnimator.ofPropertyValuesHolder(this,pvhX,pvhY).start();
mDropped = false;
break;
case DragEvent.ACTION_DRAG_ENDED:
pvhX = PropertyValuesHolder.ofFloat("scaleX", 1f);
pvhY = PropertyValuesHolder.ofFloat("scaleY", 1f);
ObjectAnimator.ofPropertyValuesHolder(this,pvhX,pvhY).start();
break;
case DragEvent.ACTION_DRAG_ENTERED:
pvhX = PropertyValuesHolder.ofFloat("scaleX", 0.75f);
pvhY = PropertyValuesHolder.ofFloat("scaleY", 0.75f);
ObjectAnimator.ofPropertyValuesHolder(this,pvhX,pvhY).start();
break;
case DragEvent.ACTION_DRAG_EXITED:
pvhX = PropertyValuesHolder.ofFloat("scaleX",0.5f);
pvhY = PropertyValuesHolder.ofFloat("scaleY", 0.5f);
ObjectAnimator.ofPropertyValuesHolder(this,pvhX,pvhY).start();
break;
case DragEvent.ACTION_DROP:
Keyframe frame0 = Keyframe.ofFloat(0f, 0.75f);
Keyframe frame1 = Keyframe.ofFloat(0.5f, 0f);
Keyframe frame2 = Keyframe.ofFloat(1f, 0.75f);
pvhX = PropertyValuesHolder.ofKeyframe("scaleX", frame0, frame1, frame2);
pvhY = PropertyValuesHolder.ofKeyframe("scaleY", frame0, frame1, frame2);
ObjectAnimator.ofPropertyValuesHolder(this, pvhX, pvhY).start();
name = (CharSequence) event.getLocalState();
setText(name);
mDropped = true;
break;
default:
return false;
}
return true;
}
}
然后我将这些按钮和我的 TextView 放在我的 XML-File 中：
<TableLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="60dp"
android:id="@+id/tableLayout"
android:clickable="false"
android:theme="@android:style/DeviceDefault.Light.ButtonBar.AlertDialog">
<TableRow>
<com.example.scuba.dragdrop.DropTargetView
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn1"
android:layout_margin="15dp"
android:text="1"
/>
<com.example.scuba.dragdrop.DropTargetView
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="2"
android:id="@+id/btn2"
android:layout_margin="15dp"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="10"
android:id="@+id/Tv"
android:layout_below="@+id/tableLayout"
android:layout_centerHorizontal="true"
android:layout_marginTop="77dp" />
我通过长按 TextView 开始拖动操作：
public class WriteDigital extends AppCompatActivity implements View.OnLongClickListener {
public CharSequence value;
TextView Tv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_write_digital);
Tv = (TextView) findViewById(R.id.Tv);
Tv.setOnLongClickListener(this);
value = Tv.getText();
}
@Override
public boolean onLongClick(View v) {
DragShadowBuilder shadowBuilder = new DragShadowBuilder(v);
v.startDrag(null,shadowBuilder,value,0);
return false;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_write_digital, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
所以当我开始拖动时，一切都很好并且动画效果很好。但是，一旦我将 TextView 拖到 Button 上，应用 crashes.I 就会出现很多错误。有人说String不能在spannable中转换??
另外我想知道使用剪辑数据而不是本地状态来传递文本信息是否更好，我该如何做到这一点？ 希望有人能帮忙。
这是我在 logcat 中的错误：
08-21 08:38:15.770 27274-27274/com.example.scuba.arduinoremote E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.scuba.arduinoremote, PID: 27274
java.lang.ClassCastException: java.lang.String cannot be cast to android.text.Spannable
at android.widget.TextView.onDragEvent(TextView.java:8767)
at android.view.View.dispatchDragEvent(View.java:17401)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1249)
at android.view.ViewRootImpl.handleDragEvent(ViewRootImpl.java:5026)
at android.view.ViewRootImpl.access0(ViewRootImpl.java:96)
at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:3213)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:149)
at android.app.ActivityThread.main(ActivityThread.java:5061)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:610)
at dalvik.system.NativeStart.main(Native Method)
package com.vijay.dragdrop;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.os.IBinder;
import android.os.Vibrator;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import java.util.ArrayList;
public class DragController
{
private static final String TAG = "DragController";
/** Indicates the drag is a move. */
public static int DRAG_ACTION_MOVE = 0;
/** Indicates the drag is a copy. */
public static int DRAG_ACTION_COPY = 1;
private static final int VIBRATE_DURATION = 35;
private static final boolean PROFILE_DRAWING_DURING_DRAG = false;
private Context mContext;
private Vibrator mVibrator;
private Rect mRectTemp = new Rect();
private final int[] mCoordinatesTemp = new int[2];
/** Whether or not we're dragging. */
private boolean mDragging;
/** X coordinate of the down event. */
private float mMotionDownX;
/** Y coordinate of the down event. */
private float mMotionDownY;
/** Info about the screen for clamping. */
private DisplayMetrics mDisplayMetrics = new DisplayMetrics();
/** Original view that is being dragged. */
private View mOriginator;
/** X offset from the upper-left corner of the cell to where we touched. */
private float mTouchOffsetX;
/** Y offset from the upper-left corner of the cell to where we touched. */
private float mTouchOffsetY;
/** Where the drag originated */
private DragSource mDragSource;
/** The data associated with the object being dragged */
private Object mDragInfo;
/** The view that moves around while you drag. */
private DragView mDragView;
/** Who can receive drop events */
private ArrayList<DropTarget> mDropTargets = new ArrayList<DropTarget>();
private DragListener mListener;
/** The window token used as the parent for the DragView. */
private IBinder mWindowToken;
private View mMoveTarget;
private DropTarget mLastDropTarget;
private InputMethodManager mInputMethodManager;
interface DragListener
{
void onDragStart(DragSource source, Object info, int dragAction);
void onDragEnd();
}
public DragController(Context context)
{
mContext = context;
mVibrator = (Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
}
public void startDrag(View v, DragSource source, Object dragInfo, int dragAction)
{
boolean doDrag = source.allowDrag();
if (!doDrag)
return;
mOriginator = v;
Bitmap b = getViewBitmap(v);
if (b == null)
{
return;
}
int[] loc = mCoordinatesTemp;
v.getLocationOnScreen(loc);
int screenX = loc[0];
int screenY = loc[1];
startDrag(b, screenX, screenY, 0, 0, b.getWidth(), b.getHeight(), source, dragInfo, dragAction);
b.recycle();
if (dragAction == DRAG_ACTION_MOVE)
{
v.setVisibility(View.GONE);
}
}
public void startDrag(Bitmap b, int screenX, int screenY, int textureLeft, int textureTop, int textureWidth, int textureHeight, DragSource source, Object dragInfo, int dragAction)
{
if (PROFILE_DRAWING_DURING_DRAG)
{
android.os.Debug.startMethodTracing("Launcher");
}
if (mInputMethodManager == null)
{
mInputMethodManager = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
}
mInputMethodManager.hideSoftInputFromWindow(mWindowToken, 0);
if (mListener != null)
{
mListener.onDragStart(source, dragInfo, dragAction);
}
int registrationX = ((int) mMotionDownX) - screenX;
int registrationY = ((int) mMotionDownY) - screenY;
mTouchOffsetX = mMotionDownX - screenX;
mTouchOffsetY = mMotionDownY - screenY;
mDragging = true;
mDragSource = source;
mDragInfo = dragInfo;
mVibrator.vibrate(VIBRATE_DURATION);
DragView dragView = mDragView = new DragView(mContext, b, registrationX, registrationY, textureLeft, textureTop, textureWidth, textureHeight);
dragView.show(mWindowToken, (int) mMotionDownX, (int) mMotionDownY);
}
private Bitmap getViewBitmap(View v)
{
v.clearFocus();
v.setPressed(false);
boolean willNotCache = v.willNotCacheDrawing();
v.setWillNotCacheDrawing(false);
int color = v.getDrawingCacheBackgroundColor();
v.setDrawingCacheBackgroundColor(0);
if (color != 0)
{
v.destroyDrawingCache();
}
v.buildDrawingCache();
Bitmap cacheBitmap = v.getDrawingCache();
if (cacheBitmap == null)
{
Log.e(TAG, "failed getViewBitmap(" + v + ")", new RuntimeException());
return null;
}
Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
v.destroyDrawingCache();
v.setWillNotCacheDrawing(willNotCache);
v.setDrawingCacheBackgroundColor(color);
return bitmap;
}
public boolean dispatchKeyEvent(KeyEvent event)
{
return mDragging;
}
public void cancelDrag()
{
endDrag();
}
private void endDrag()
{
if (mDragging)
{
mDragging = false;
if (mOriginator != null)
{
mOriginator.setVisibility(View.VISIBLE);
}
if (mListener != null)
{
mListener.onDragEnd();
}
if (mDragView != null)
{
mDragView.remove();
mDragView = null;
}
}
}
public boolean onInterceptTouchEvent(MotionEvent ev)
{
final int action = ev.getAction();
if (action == MotionEvent.ACTION_DOWN)
{
recordScreenSize();
}
final int screenX = clamp((int) ev.getRawX(), 0, mDisplayMetrics.widthPixels);
final int screenY = clamp((int) ev.getRawY(), 0, mDisplayMetrics.heightPixels);
switch (action)
{
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_DOWN:
mMotionDownX = screenX;
mMotionDownY = screenY;
mLastDropTarget = null;
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if (mDragging)
{
drop(screenX, screenY);
}
endDrag();
break;
}
return mDragging;
}
void setMoveTarget(View view)
{
mMoveTarget = view;
}
public boolean dispatchUnhandledMove(View focused, int direction)
{
return mMoveTarget != null && mMoveTarget.dispatchUnhandledMove(focused, direction);
}
public boolean onTouchEvent(MotionEvent ev)
{
if (!mDragging)
{
return false;
}
final int action = ev.getAction();
final int screenX = clamp((int) ev.getRawX(), 0, mDisplayMetrics.widthPixels);
final int screenY = clamp((int) ev.getRawY(), 0, mDisplayMetrics.heightPixels);
switch (action)
{
case MotionEvent.ACTION_DOWN:
mMotionDownX = screenX;
mMotionDownY = screenY;
break;
case MotionEvent.ACTION_MOVE:
mDragView.move((int) ev.getRawX(), (int) ev.getRawY());
final int[] coordinates = mCoordinatesTemp;
DropTarget dropTarget = findDropTarget(screenX, screenY, coordinates);
if (dropTarget != null)
{
if (mLastDropTarget == dropTarget)
{
dropTarget.onDragOver(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
}
else
{
if (mLastDropTarget != null)
{
mLastDropTarget.onDragExit(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
}
dropTarget.onDragEnter(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
}
}
else
{
if (mLastDropTarget != null)
{
mLastDropTarget.onDragExit(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
}
}
mLastDropTarget = dropTarget;
break;
case MotionEvent.ACTION_UP:
if (mDragging)
{
drop(screenX, screenY);
}
endDrag();
break;
case MotionEvent.ACTION_CANCEL:
cancelDrag();
}
return true;
}
private boolean drop(float x, float y)
{
final int[] coordinates = mCoordinatesTemp;
DropTarget dropTarget = findDropTarget((int) x, (int) y, coordinates);
if (dropTarget != null)
{
dropTarget.onDragExit(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
if (dropTarget.acceptDrop(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo))
{
dropTarget.onDrop(mDragSource, coordinates[0], coordinates[1], (int) mTouchOffsetX, (int) mTouchOffsetY, mDragView, mDragInfo);
mDragSource.onDropCompleted((View) dropTarget, true);
return true;
}
else
{
mDragSource.onDropCompleted((View) dropTarget, false);
return true;
}
}
return false;
}
private DropTarget findDropTarget(int x, int y, int[] dropCoordinates)
{
final Rect r = mRectTemp;
final ArrayList<DropTarget> dropTargets = mDropTargets;
final int count = dropTargets.size();
for (int i = count - 1; i >= 0; i--)
{
final DropTarget target = dropTargets.get(i);
target.getHitRect(r);
target.getLocationOnScreen(dropCoordinates);
r.offset(dropCoordinates[0] - target.getLeft(), dropCoordinates[1] - target.getTop());
if (r.contains(x, y))
{
dropCoordinates[0] = x - dropCoordinates[0];
dropCoordinates[1] = y - dropCoordinates[1];
return target;
}
}
return null;
}
private void recordScreenSize()
{
((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(mDisplayMetrics);
}
private static int clamp(int val, int min, int max)
{
if (val < min)
{
return min;
}
else if (val >= max)
{
return max - 1;
}
else
{
return val;
}
}
public void setWindowToken(IBinder token)
{
mWindowToken = token;
}
public void setDragListener(DragListener l)
{
mListener = l;
}
public void removeDragListener(DragListener l)
{
mListener = null;
}
public void addDropTarget(DropTarget target)
{
mDropTargets.add(target);
}
public void removeDropTarget(DropTarget target)
{
mDropTargets.remove(target);
}
}
您似乎使用了错误的 setText()
您的代码应如下所示
setText(name, TextView.BufferType.SPANNABLE);