将 intent.putExtras 传递给新的 activity tablayout
Passing intent.putExtras to a new activity tablayout
如何将数据从我的 intent.putExtra 传递到新的 activity，这是一个表格布局？我尝试了很多可能的方法，但无法查看数据，而且当我滑动到选项卡的另一个位置时，我会崩溃。
这是我的代码
customAdapter.java
此代码来自我的 recyclerview 我添加了一个 onClickListener 并使用 toast 我能够测试显示来自我的数据库的适当数据的项目这很好因为它告诉我我已经成功地从我的单击时的数据库。但现在我希望它将它们的值从我的数据库传递到另一个 activity 但它不显示任何内容。
注意 onClick() 方法
public static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView textViewTerm;
List<DataModel> items = new ArrayList<DataModel>();
Context context;
public MyViewHolder(View itemView, Context context, List<DataModel> items) {
super(itemView);
this.items = items;
this.context = context;
itemView.setOnClickListener(this);
this.textViewTerm = (TextView) itemView.findViewById(R.id.textViewTerm);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int position = getAdapterPosition();
DataModel item = this.items.get(position);
Toast.makeText(context, "ID number: "+item.getId() +" is selected", Toast.LENGTH_SHORT).show();
Intent i = new Intent(this.context,My_Notes_View_Main.class);
i.putExtra("note_id",item.getId());
i.putExtra("note_def",item.getDefinition());
i.putExtra("note_syntax",item.getSyntax());
i.putExtra("note_code", item.getCode());
this.context.startActivity(i);
}
}
这是我的 activity，其中包含 tablayout
我尝试添加一个 if/else 语句，如果它们的位置发生变化，textView 值将替换它从另一个 activity.It 获取的内容，它位于 onTabSelectedListener() 内部，但每当我从另一个位置更改时都会导致崩溃。
package com.zaid.recyclerviewsqlite.viewNotes;
import android.os.Bundle; import android.support.design.widget.TabLayout; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.View; import android.widget.ImageButton; import android.widget.TextView; import android.widget.Toast;
import com.zaid.recyclerviewsqlite.R;
public class My_Notes_View_Main extends AppCompatActivity implements View.OnClickListener {
private final int numOfPages = 3;
private final String[] pageTitle = {"Definition", "Syntax", "Code"};
private ImageButton view;
private TextView content;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_notes_view_main);
view = (ImageButton)findViewById(R.id.view);
content = (TextView)findViewById(R.id.textView);
view();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar1);
setSupportActionBar(toolbar);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
for (int i = 0; i < numOfPages; i++) {
tabLayout.addTab(tabLayout.newTab().setText(pageTitle[i]));
}
//set gravity for tab bar
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
final PagerAdapter adapter = new My_Notes_View_MyPagerAdapter(getSupportFragmentManager(), numOfPages);
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(onTabSelectedListener(viewPager));
}
private TabLayout.OnTabSelectedListener onTabSelectedListener(final ViewPager pager) {
return new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
pager.setCurrentItem(tab.getPosition());
/**
if(tab.getPosition() == 1){
content.setText(getIntent().getStringExtra("note_def"));
} else if (tab.getPosition() == 2) {
content.setText(getIntent().getStringExtra("note_syntax"));
} else if (tab.getPosition() == 3) {
content.setText(getIntent().getStringExtra("note_code"));
}
*/
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
};
}
/** @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my_notes_add_main_menu, menu);
return true;
} */
public void view(){
view.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Add Click", Toast.LENGTH_SHORT).show(); }
});
}
@Override public void onClick(View v) { // TODO Auto-generated method stub
}
}
我的 LogCat 已经明确指出我的 onTabSelectedListener() 第 63 行中有一个 nullPointerException，但我不知道如何解决这个问题。
这是我的 LogCat
03-18 12:25:39.582: E/InputEventReceiver(16326): Exception dispatching input event.
03-18 12:25:39.582: E/MessageQueue-JNI(16326): Exception in MessageQueue callback: handleReceiveCallback
03-18 12:25:39.592: D/dalvikvm(16326): GC_FOR_ALLOC freed 242K, 8% free 3959K/4276K, paused 10ms, total 10ms
03-18 12:25:39.602: E/MessageQueue-JNI(16326): java.lang.NullPointerException
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at com.zaid.recyclerviewsqlite.viewNotes.My_Notes_View_Main.onTabSelected(My_Notes_View_Main.java:62)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.design.widget.TabLayout.selectTab(TabLayout.java:871)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.design.widget.TabLayout$TabLayoutOnPageChangeListener.onPageSelected(TabLayout.java:1759)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v4.view.ViewPager.dispatchOnPageSelected(ViewPager.java:1794)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:569)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:553)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:2102)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.View.dispatchTouchEvent(View.java:7711)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2210)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1945)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.app.Activity.dispatchTouchEvent(Activity.java:2458)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.View.dispatchPointerEvent(View.java:7891)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3954)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3833)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3525)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3582)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5602)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5582)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5553)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5682)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.os.MessageQueue.nativePollOnce(Native Method)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.os.MessageQueue.next(MessageQueue.java:138)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.os.Looper.loop(Looper.java:123)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.app.ActivityThread
03-18 12:25:39.602: D/AndroidRuntime(16326): Shutting down VM
如果@+id/textView不在my_notes_view_main.xml
则content为空
content = (TextView)findViewById(R.id.textView);
来自 findViewById
的文档
Finds a view that was identified by the id attribute from the XML that was processed in onCreate(Bundle).
Returns - The view if found or null otherwise
由于您提到视图是 Fragment 布局的一部分，因此它为 null，您将收到 NullPointerException。
如何将数据从我的 intent.putExtra 传递到新的 activity，这是一个表格布局？我尝试了很多可能的方法，但无法查看数据，而且当我滑动到选项卡的另一个位置时，我会崩溃。
这是我的代码
customAdapter.java
此代码来自我的 recyclerview 我添加了一个 onClickListener 并使用 toast 我能够测试显示来自我的数据库的适当数据的项目这很好因为它告诉我我已经成功地从我的单击时的数据库。但现在我希望它将它们的值从我的数据库传递到另一个 activity 但它不显示任何内容。
注意 onClick() 方法
public static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView textViewTerm;
List<DataModel> items = new ArrayList<DataModel>();
Context context;
public MyViewHolder(View itemView, Context context, List<DataModel> items) {
super(itemView);
this.items = items;
this.context = context;
itemView.setOnClickListener(this);
this.textViewTerm = (TextView) itemView.findViewById(R.id.textViewTerm);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int position = getAdapterPosition();
DataModel item = this.items.get(position);
Toast.makeText(context, "ID number: "+item.getId() +" is selected", Toast.LENGTH_SHORT).show();
Intent i = new Intent(this.context,My_Notes_View_Main.class);
i.putExtra("note_id",item.getId());
i.putExtra("note_def",item.getDefinition());
i.putExtra("note_syntax",item.getSyntax());
i.putExtra("note_code", item.getCode());
this.context.startActivity(i);
}
}
这是我的 activity，其中包含 tablayout 我尝试添加一个 if/else 语句，如果它们的位置发生变化，textView 值将替换它从另一个 activity.It 获取的内容，它位于 onTabSelectedListener() 内部，但每当我从另一个位置更改时都会导致崩溃。
package com.zaid.recyclerviewsqlite.viewNotes;
import android.os.Bundle; import android.support.design.widget.TabLayout; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.view.View; import android.widget.ImageButton; import android.widget.TextView; import android.widget.Toast;
import com.zaid.recyclerviewsqlite.R;
public class My_Notes_View_Main extends AppCompatActivity implements View.OnClickListener {
private final int numOfPages = 3;
private final String[] pageTitle = {"Definition", "Syntax", "Code"};
private ImageButton view;
private TextView content;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_notes_view_main);
view = (ImageButton)findViewById(R.id.view);
content = (TextView)findViewById(R.id.textView);
view();
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar1);
setSupportActionBar(toolbar);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
for (int i = 0; i < numOfPages; i++) {
tabLayout.addTab(tabLayout.newTab().setText(pageTitle[i]));
}
//set gravity for tab bar
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
final PagerAdapter adapter = new My_Notes_View_MyPagerAdapter(getSupportFragmentManager(), numOfPages);
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(onTabSelectedListener(viewPager));
}
private TabLayout.OnTabSelectedListener onTabSelectedListener(final ViewPager pager) {
return new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
pager.setCurrentItem(tab.getPosition());
/**
if(tab.getPosition() == 1){
content.setText(getIntent().getStringExtra("note_def"));
} else if (tab.getPosition() == 2) {
content.setText(getIntent().getStringExtra("note_syntax"));
} else if (tab.getPosition() == 3) {
content.setText(getIntent().getStringExtra("note_code"));
}
*/
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
};
}
/** @Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my_notes_add_main_menu, menu);
return true;
} */
public void view(){
view.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Add Click", Toast.LENGTH_SHORT).show(); }
});
}
@Override public void onClick(View v) { // TODO Auto-generated method stub
}
}
我的 LogCat 已经明确指出我的 onTabSelectedListener() 第 63 行中有一个 nullPointerException，但我不知道如何解决这个问题。
这是我的 LogCat
03-18 12:25:39.582: E/InputEventReceiver(16326): Exception dispatching input event.
03-18 12:25:39.582: E/MessageQueue-JNI(16326): Exception in MessageQueue callback: handleReceiveCallback
03-18 12:25:39.592: D/dalvikvm(16326): GC_FOR_ALLOC freed 242K, 8% free 3959K/4276K, paused 10ms, total 10ms
03-18 12:25:39.602: E/MessageQueue-JNI(16326): java.lang.NullPointerException
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at com.zaid.recyclerviewsqlite.viewNotes.My_Notes_View_Main.onTabSelected(My_Notes_View_Main.java:62)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.design.widget.TabLayout.selectTab(TabLayout.java:871)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.design.widget.TabLayout$TabLayoutOnPageChangeListener.onPageSelected(TabLayout.java:1759)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v4.view.ViewPager.dispatchOnPageSelected(ViewPager.java:1794)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:569)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:553)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:2102)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.View.dispatchTouchEvent(View.java:7711)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2210)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1945)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.app.Activity.dispatchTouchEvent(Activity.java:2458)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.View.dispatchPointerEvent(View.java:7891)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3954)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3833)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3525)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3582)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5602)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5582)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5553)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5682)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.os.MessageQueue.nativePollOnce(Native Method)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.os.MessageQueue.next(MessageQueue.java:138)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.os.Looper.loop(Looper.java:123)
03-18 12:25:39.602: E/MessageQueue-JNI(16326): at android.app.ActivityThread
03-18 12:25:39.602: D/AndroidRuntime(16326): Shutting down VM
如果@+id/textView不在my_notes_view_main.xml
则content为空
content = (TextView)findViewById(R.id.textView);
来自 findViewById
Finds a view that was identified by the id attribute from the XML that was processed in
onCreate(Bundle).Returns - The view if found or null otherwise
由于您提到视图是 Fragment 布局的一部分，因此它为 null，您将收到 NullPointerException。