如何使用菜单选项从另一个 activity 格式化一个 activity
How to format an activity from another activity using menu options
嗨,我是 Android 的新手,我想从菜单选项中更改 Activity 的文本视图大小和文本视图颜色,我不知道该怎么做
我创建了一个这样的菜单项
<item android:id="@+id/menu_item_share"
android:title="Share"
android:showAsAction="ifRoom|withText"
android:orderInCategory="100"
app:actionProviderClass="android.support.v7.widget.ShareActionProvider" />
<item android:id="@+id/display"
android:orderInCategory="100"
android:showAsAction="ifRoom|withText"
android:title="Display Option"
android:actionLayout="@layout/custom_setting" />
当我从当前布局菜单选项中单击 显示选项 时,需要调用一个新布局。我在该布局中创建了 两个按钮 一个是 Plus Button,另一个是 Minus Button,我希望这些按钮对之前的布局进行更改。
当我单击加号按钮时,文本视图文本想要更改,而当我单击减号按钮时,文本视图大小被减小。
点击菜单项时的自定义布局代码
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.aeiltech.sidd.CustomSetting" android:background="@mipmap/bg">
<ImageButton
android:layout_width="50dp"
android:layout_height="40dp"
android:background="@drawable/close"
android:layout_above="@+id/textView"
android:layout_toRightOf="@+id/minus"
android:layout_toEndOf="@+id/minus"
android:id="@+id/close" />
<ImageButton
android:layout_width="50dp"
android:layout_height="40dp"
android:background="@drawable/plusign"
android:layout_marginTop="110dp"
android:id="@+id/plus"
android:layout_alignParentTop="true"
android:layout_alignLeft="@+id/textView"
android:layout_alignStart="@+id/textView" />
<ImageButton
android:layout_width="50dp"
android:layout_height="40dp"
android:background="@drawable/minusign"
android:id="@+id/minus"
android:layout_alignTop="@+id/plus"
android:layout_alignRight="@+id/textView"
android:layout_alignEnd="@+id/textView" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Change Text Size"
android:id="@+id/textView"
android:layout_above="@+id/minus"
android:layout_centerHorizontal="true"
android:textColor="#FFFFFF" />
</RelativeLayout>
详细信息Activity(这个Activity有一个Textview)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detail_activity);
detailtext= (TextView) findViewById(R.id.detail);
dbHelper = new SqlLiteDbHelper(this);
try {
dbHelper.openDataBase();
} catch (SQLException e) {
e.printStackTrace();
}
sqLiteDatabase = dbHelper.getReadableDatabase();
cursor=dbHelper.getdetails(sqLiteDatabase, selectedData);
if(cursor.moveToFirst())
{
detailtext.setText(cursor.getString(0));
}
@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_detail, menu);
MenuItem shareItem = menu.findItem(R.id.menu_item_share);
mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(shareItem);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (id==R.id.display_option)
{
LayoutInflater layoutInflater= (LayoutInflater) getApplicationContext().getSystemService(LAYOUT_INFLATER_SERVICE);
layoutInflater.inflate(R.layout.custom_setting,null);
}
return super.onOptionsItemSelected(item);
}
为了帮助澄清,这个问题与这个
是同一个应用和作者
尝试 this.Hopefully 它有效。
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
MenuInflater inflater=getMenuInflater();
inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
//OnOptionItemSelected
@Override
public boolean OnOptionItemSelected(MenuItem item)
{
switch(item.getItemId())
{
case R.id.menu_item_share:
Toast.makeText(getApplicationContext(), "Hello", Toast.LENGTH_LONG).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
尝试
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (id==R.id.display_option)
{
setContentView(R.layout.YOUR_LAYOUT)
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (id==R.id.display_option)
{
myCustomLayout();
}
return super.onOptionsItemSelected(item);
}
public void myCustomLayout(){
LinearLayout ll = new LinearLayout(getActivity());
ll.setOrientation(LinearLayout.VERTICAL);
View customView = LayoutInflater.from(getActivity()).inflate(R.layout.my_custom_layout,null,false);
ll.addView(customView);
parentView.addView(ll); // parentView is a layout in your activity xml;
}
以DialogFragment 的形式显示新布局。这个想法是以 DialogFragment 弹出窗口的形式显示 increase/Decrease 选项。您可以从弹出窗口中 increase/decrease 大小。弹出窗口关闭后,所选大小将设置为 Activity.
中的 TextView
MainActivity.java
public class MainActivity extends AppCompatActivity {
public static int updatedSize;
TextView greetingText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
greetingText = (TextView)findViewById(R.id.hello_world_text);
}
@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_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
mycustomLayout();
return true;
}
return super.onOptionsItemSelected(item);
}
public void mycustomLayout(){
FragmentManager manager = getFragmentManager();
PopUp popUp = new PopUp(new FragmentDismissHandler());
popUp.show(manager,"POPUP");
}
public void refreshText(){
if( updatedSize>0)
greetingText.setTextSize(updatedSize);
}
private class FragmentDismissHandler extends Handler {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
refreshText();
}
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<TextView
android:id="@+id/hello_world_text"
android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
PopUp.java(自定义布局为 DialogFragment)
public class PopUp extends DialogFragment implements View.OnClickListener{
Button increase,decrease,set;
TextView sizeOfText;
static int size;
Handler handler;
public PopUp(Handler handler) {
this.handler = handler;
}
public PopUp(){
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
getDialog().setTitle("change text size");
View view = inflater.inflate(R.layout.my_custom_layout, container, false);
increase = (Button)view.findViewById(R.id.inc);
increase.setOnClickListener(this);
decrease = (Button)view.findViewById(R.id.dec);
decrease.setOnClickListener(this);
sizeOfText = (TextView)view.findViewById(R.id.size_text);
sizeOfText.setText("text");
set = (Button)view.findViewById(R.id.ok);
set.setOnClickListener(this);
size = (int) sizeOfText.getTextSize();
return view;
}
@Override
public void onClick(View view) {
int id= view.getId();
if(id==R.id.inc){
size = size +1;
sizeOfText.setText("text");
sizeOfText.setTextSize(size);
}
if(id== R.id.dec){
size = size - 1;
sizeOfText.setText("text");
sizeOfText.setTextSize(size);
}
if(id== R.id.ok){
dismiss();
}
}
@Override
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
MainActivity.updatedSize = size;
handler.sendEmptyMessage(0);
}
}
my_custom_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white">
<Button
android:id="@+id/inc"
android:text="increase"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/dec"
android:text="decrease"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/size_text"
android:padding="20dp"
android:textColor="@android:color/black"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/ok"
android:text="set"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
有时我会跟踪用户 activity 的流程以全面了解他们想要实现的目标,而且通常他们做出的设计选择是基于他们在此处收到的答案,因此nest问题是基于上一题提供的解决方案。有时这很好,有时这个人没有很好地掌握可供他们使用的设计选项。
所以回答问题:
有很多方法可以做到这一点(我的列表并不详尽),我建议了一些并演示了一个。
您可以使用:
- 碎片
- 共享偏好
- 意图
- 菜单中有调整大小选项
我选择演示片段,因为它对许多其他事情和有用的技能都有用。
使用加号和减号按钮创建一个片段,而不是单独的 activity。这样片段
可以直接访问附件 activity.
的方法
使用菜单选项调用 activity 的 showButtonOptions() 方法。
在你的 activity 内:
Fragment fragment;
FrameLayout frameLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
..../
View view = this.findViewById(android.R.id.My_Activity);
frameLayout = (FrameLayout) findViewById(R.id.fragFrame);
..../
}
public void ChangeMyLayoutMethod(args){
..../
//use args to make change.
}
public void showButtonOptions() {
// Create new fragment and transaction
fragment = new MyPlusAndMinusButtonFragment();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.fragFrame, fragment);
fragmentTransaction.commit();
frameLayout.setVisibility(View.VISIBLE);
}
public void returnToActivity() {
frameLayout.setVisibility(View.GONE);
// To do manage your back stack.
}
在你的 Activity xml
<RelativeLayout ... or whatever ...>
.../ Details of that activity
<FrameLayout
android:id="@+id/fragFrame"
android:layout_below="@+id/wherever"
android:layout_height="your choice"
android:layout_width="your choice"
android:layout_marginTop=".. etc"
android:visibility="gone">
</RelativeLayout>
创建片段:
public class MyPlusAndMinusButtonFragment extends Fragment {
FragmentManager fragmentManager;
..../
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view =
inflater.inflate(R.layout.My_Plus_And_Minus_Button_Fragment, container, false);
fragmentManager = getFragmentManager();
...../
return view;
}
//To Do
// Manage button clicks//
onClick(){
// Call the parent's activity's
// Cast this activity to type of parent activity.
((MyActivity) getActivity()).ChangeMyLayoutMethod(args);
}
片段布局,My_Plus_And_Minus_Button_Fragment.xml:
<FrameLayout .....>
<RelativeLayout ....>
<ImageButtons etc...
..../
</RelativeLayout>
</FrameLayout>
与大多数编程设计决策一样,可以有许多正确的解决方案,有些比其他的更好,有些只是首选设计选择的问题。在我们有选择之前,我们别无选择。
嗨,我是 Android 的新手,我想从菜单选项中更改 Activity 的文本视图大小和文本视图颜色,我不知道该怎么做
我创建了一个这样的菜单项
<item android:id="@+id/menu_item_share"
android:title="Share"
android:showAsAction="ifRoom|withText"
android:orderInCategory="100"
app:actionProviderClass="android.support.v7.widget.ShareActionProvider" />
<item android:id="@+id/display"
android:orderInCategory="100"
android:showAsAction="ifRoom|withText"
android:title="Display Option"
android:actionLayout="@layout/custom_setting" />
当我从当前布局菜单选项中单击 显示选项 时,需要调用一个新布局。我在该布局中创建了 两个按钮 一个是 Plus Button,另一个是 Minus Button,我希望这些按钮对之前的布局进行更改。
当我单击加号按钮时,文本视图文本想要更改,而当我单击减号按钮时,文本视图大小被减小。
点击菜单项时的自定义布局代码
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.aeiltech.sidd.CustomSetting" android:background="@mipmap/bg">
<ImageButton
android:layout_width="50dp"
android:layout_height="40dp"
android:background="@drawable/close"
android:layout_above="@+id/textView"
android:layout_toRightOf="@+id/minus"
android:layout_toEndOf="@+id/minus"
android:id="@+id/close" />
<ImageButton
android:layout_width="50dp"
android:layout_height="40dp"
android:background="@drawable/plusign"
android:layout_marginTop="110dp"
android:id="@+id/plus"
android:layout_alignParentTop="true"
android:layout_alignLeft="@+id/textView"
android:layout_alignStart="@+id/textView" />
<ImageButton
android:layout_width="50dp"
android:layout_height="40dp"
android:background="@drawable/minusign"
android:id="@+id/minus"
android:layout_alignTop="@+id/plus"
android:layout_alignRight="@+id/textView"
android:layout_alignEnd="@+id/textView" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Change Text Size"
android:id="@+id/textView"
android:layout_above="@+id/minus"
android:layout_centerHorizontal="true"
android:textColor="#FFFFFF" />
</RelativeLayout>
详细信息Activity(这个Activity有一个Textview)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.detail_activity);
detailtext= (TextView) findViewById(R.id.detail);
dbHelper = new SqlLiteDbHelper(this);
try {
dbHelper.openDataBase();
} catch (SQLException e) {
e.printStackTrace();
}
sqLiteDatabase = dbHelper.getReadableDatabase();
cursor=dbHelper.getdetails(sqLiteDatabase, selectedData);
if(cursor.moveToFirst())
{
detailtext.setText(cursor.getString(0));
}
@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_detail, menu);
MenuItem shareItem = menu.findItem(R.id.menu_item_share);
mShareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(shareItem);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (id==R.id.display_option)
{
LayoutInflater layoutInflater= (LayoutInflater) getApplicationContext().getSystemService(LAYOUT_INFLATER_SERVICE);
layoutInflater.inflate(R.layout.custom_setting,null);
}
return super.onOptionsItemSelected(item);
}
为了帮助澄清,这个问题与这个
尝试 this.Hopefully 它有效。
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
MenuInflater inflater=getMenuInflater();
inflater.inflate(R.menu.main, menu);
return super.onCreateOptionsMenu(menu);
}
//OnOptionItemSelected
@Override
public boolean OnOptionItemSelected(MenuItem item)
{
switch(item.getItemId())
{
case R.id.menu_item_share:
Toast.makeText(getApplicationContext(), "Hello", Toast.LENGTH_LONG).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
尝试
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (id==R.id.display_option)
{
setContentView(R.layout.YOUR_LAYOUT)
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (id==R.id.display_option)
{
myCustomLayout();
}
return super.onOptionsItemSelected(item);
}
public void myCustomLayout(){
LinearLayout ll = new LinearLayout(getActivity());
ll.setOrientation(LinearLayout.VERTICAL);
View customView = LayoutInflater.from(getActivity()).inflate(R.layout.my_custom_layout,null,false);
ll.addView(customView);
parentView.addView(ll); // parentView is a layout in your activity xml;
}
以DialogFragment 的形式显示新布局。这个想法是以 DialogFragment 弹出窗口的形式显示 increase/Decrease 选项。您可以从弹出窗口中 increase/decrease 大小。弹出窗口关闭后,所选大小将设置为 Activity.
中的 TextViewMainActivity.java
public class MainActivity extends AppCompatActivity {
public static int updatedSize;
TextView greetingText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
greetingText = (TextView)findViewById(R.id.hello_world_text);
}
@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_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
mycustomLayout();
return true;
}
return super.onOptionsItemSelected(item);
}
public void mycustomLayout(){
FragmentManager manager = getFragmentManager();
PopUp popUp = new PopUp(new FragmentDismissHandler());
popUp.show(manager,"POPUP");
}
public void refreshText(){
if( updatedSize>0)
greetingText.setTextSize(updatedSize);
}
private class FragmentDismissHandler extends Handler {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
refreshText();
}
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<TextView
android:id="@+id/hello_world_text"
android:text="@string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
PopUp.java(自定义布局为 DialogFragment)
public class PopUp extends DialogFragment implements View.OnClickListener{
Button increase,decrease,set;
TextView sizeOfText;
static int size;
Handler handler;
public PopUp(Handler handler) {
this.handler = handler;
}
public PopUp(){
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
getDialog().setTitle("change text size");
View view = inflater.inflate(R.layout.my_custom_layout, container, false);
increase = (Button)view.findViewById(R.id.inc);
increase.setOnClickListener(this);
decrease = (Button)view.findViewById(R.id.dec);
decrease.setOnClickListener(this);
sizeOfText = (TextView)view.findViewById(R.id.size_text);
sizeOfText.setText("text");
set = (Button)view.findViewById(R.id.ok);
set.setOnClickListener(this);
size = (int) sizeOfText.getTextSize();
return view;
}
@Override
public void onClick(View view) {
int id= view.getId();
if(id==R.id.inc){
size = size +1;
sizeOfText.setText("text");
sizeOfText.setTextSize(size);
}
if(id== R.id.dec){
size = size - 1;
sizeOfText.setText("text");
sizeOfText.setTextSize(size);
}
if(id== R.id.ok){
dismiss();
}
}
@Override
public void onDismiss(DialogInterface dialog) {
super.onDismiss(dialog);
MainActivity.updatedSize = size;
handler.sendEmptyMessage(0);
}
}
my_custom_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white">
<Button
android:id="@+id/inc"
android:text="increase"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/dec"
android:text="decrease"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/size_text"
android:padding="20dp"
android:textColor="@android:color/black"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/ok"
android:text="set"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
有时我会跟踪用户 activity 的流程以全面了解他们想要实现的目标,而且通常他们做出的设计选择是基于他们在此处收到的答案,因此nest问题是基于上一题提供的解决方案。有时这很好,有时这个人没有很好地掌握可供他们使用的设计选项。
所以回答问题:
有很多方法可以做到这一点(我的列表并不详尽),我建议了一些并演示了一个。
您可以使用:
- 碎片
- 共享偏好
- 意图
- 菜单中有调整大小选项
我选择演示片段,因为它对许多其他事情和有用的技能都有用。
使用加号和减号按钮创建一个片段,而不是单独的 activity。这样片段 可以直接访问附件 activity.
的方法使用菜单选项调用 activity 的 showButtonOptions() 方法。
在你的 activity 内:
Fragment fragment;
FrameLayout frameLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
..../
View view = this.findViewById(android.R.id.My_Activity);
frameLayout = (FrameLayout) findViewById(R.id.fragFrame);
..../
}
public void ChangeMyLayoutMethod(args){
..../
//use args to make change.
}
public void showButtonOptions() {
// Create new fragment and transaction
fragment = new MyPlusAndMinusButtonFragment();
fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.fragFrame, fragment);
fragmentTransaction.commit();
frameLayout.setVisibility(View.VISIBLE);
}
public void returnToActivity() {
frameLayout.setVisibility(View.GONE);
// To do manage your back stack.
}
在你的 Activity xml
<RelativeLayout ... or whatever ...>
.../ Details of that activity
<FrameLayout
android:id="@+id/fragFrame"
android:layout_below="@+id/wherever"
android:layout_height="your choice"
android:layout_width="your choice"
android:layout_marginTop=".. etc"
android:visibility="gone">
</RelativeLayout>
创建片段:
public class MyPlusAndMinusButtonFragment extends Fragment {
FragmentManager fragmentManager;
..../
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view =
inflater.inflate(R.layout.My_Plus_And_Minus_Button_Fragment, container, false);
fragmentManager = getFragmentManager();
...../
return view;
}
//To Do
// Manage button clicks//
onClick(){
// Call the parent's activity's
// Cast this activity to type of parent activity.
((MyActivity) getActivity()).ChangeMyLayoutMethod(args);
}
片段布局,My_Plus_And_Minus_Button_Fragment.xml:
<FrameLayout .....>
<RelativeLayout ....>
<ImageButtons etc...
..../
</RelativeLayout>
</FrameLayout>
与大多数编程设计决策一样,可以有许多正确的解决方案,有些比其他的更好,有些只是首选设计选择的问题。在我们有选择之前,我们别无选择。