[英]How to detect which dynamically created button inside a Fragment was clicked, from Activity?
我有一個Fragment類,可以動態創建Buttons網格。 然后在顯示網格的主活動中創建該片段的實例。 這是我的代碼:
Grid.java
public class Grid extends Fragment {
LinearLayout myLayout;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
myLayout = new LinearLayout(getActivity());
LayoutParams lparams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
myLayout.setLayoutParams(lparams);
myLayout.setOrientation(LinearLayout.VERTICAL);
for (int i = 0; i < 4; i++) {
LinearLayout row = new LinearLayout(getActivity());
LayoutParams rowParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
row.setLayoutParams(rowParams);
for (int j = 0; j < 4; j++) {
final Button btnTag = new Button(getActivity());
LayoutParams btnParams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
btnTag.setLayoutParams(btnParams);
btnTag.setText(" " + (j + 1 + (i * 4)));
btnTag.setId(j + 1 + (i * 4));
row.addView(btnTag);
}
myLayout.addView(row);
}
return myLayout;
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_mainactivity);
Grid grid = new Grid();
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.grid, grid);
transaction.commit();
}
}
另外這里是我的content_mainactivity.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/content_mainactivity"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.owner.tables.MainActivity"
tools:showIn="@layout/activity_mainactivity">
<FrameLayout
android:layout_width="320dp"
android:layout_height="320dp"
android:id="@+id/grid"
android:layout_centerHorizontal="true">
</FrameLayout>
</RelativeLayout>
所以我的問題是,如何檢測活動中片段中是否單擊了哪個按鈕? 或者,如果我可以在片段中執行此操作,那么如何將信息傳遞給活動?
使用界面將點擊事件傳遞給您的活動。 在OnClickListener中調用其方法。
在MainActivity中
public void doSomethingAtClick() {...}
片段中
((MainActivity)getActivity()).doSomethingAtClick()
創建一個接口:
public interface MyGridInterface {
void myAction(<Params...>);
}
在片段中設置偵聽器:
MainActivity mActivity = new MainActivity();
setEleListener(mActivity);
public void setMyListener(MyGridInterface listener) {
this.gListener = listener;
}
在MainActivity中實現偵聽器
public class MainActivity extends AppCompatActivity implements MyGridInterface{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_mainactivity);
Grid grid = new Grid();
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.add(R.id.grid, grid);
transaction.commit();
}
@Override
public void myAction(<Params..>) {
//Here do whatever you want
}
}
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