[英]Add click listener to Buttons in ListView
初學者在這里。 我正在使用CursorAdapter
和ListView
。 我每行有兩個按鈕(項目?)。 我想向他們添加點擊偵聽器,這樣我就可以在同一行中隱藏/顯示TextViews
。
這是我的適配器:
public class ToDoCursorAdapter extends CursorAdapter {
public ToDoCursorAdapter(Context context, Cursor cursor) {
super(context, cursor, 0);
}
// The newView method is used to inflate a new view and return it,
// you don't bind any data to the view at this point.
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return LayoutInflater.from(context).inflate(R.layout.listview, parent, false);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
TextView engText = (TextView) view.findViewById(R.id.engText);
TextView arabText = (TextView) view.findViewById(R.id.arabText);
TextView refText = (TextView) view.findViewById(R.id.refText);
String arabic = cursor.getString(cursor.getColumnIndexOrThrow("PlainArab_Text"));
String english = cursor.getString(cursor.getColumnIndexOrThrow("PlainEng_Text"));
String ref = cursor.getString(cursor.getColumnIndexOrThrow("REF"));
arabText.setText(arabic);
engText.setText(english);
refText.setText(ref);
}
}
適配器xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/button"
android:layout_width="0sp"
android:layout_weight="0.5"
android:layout_height="wrap_content"
android:text="Left Button"
/>
<Button
android:id="@+id/button2"
android:layout_width="0sp"
android:layout_weight="0.5"
android:layout_height="wrap_content"
android:text="Right Button"
/>
</LinearLayout>
<TextView
android:id="@+id/engText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10sp"
android:textSize="15sp"
android:typeface="serif"/>
<TextView
android:id="@+id/arabText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10sp"
android:textSize="15sp"
android:typeface="sans"
/>
<TextView
android:id="@+id/refText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10sp"
android:textSize="15sp" />
</LinearLayout>
活動代碼:
public class ListViewActivity extends Activity {
ListView listView ;
private SQLiteDatabase hadlistDB;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_listview);
DatabaseHelper1 hadlistDBHelper;
hadlistDBHelper = new DatabaseHelper1(this);
try {
hadlistDBHelper.createDataBase();
}
catch (IOException ioe)
{
throw new Error("Unable to create database");
}
hadlistDB = hadlistDBHelper.openDataBase();
Cursor todoCursor = hadlistDB.rawQuery("SELECT ID as _id, * FROM HAD_TABLE WHERE ID < 5 ", null);
// Find ListView to populate
ListView lvItems = (ListView) findViewById(R.id.list);
// Setup cursor adapter using cursor from last step
ToDoCursorAdapter todoAdapter = new ToDoCursorAdapter(this, todoCursor);
// Attach cursor adapter to the ListView
lvItems.setAdapter(todoAdapter);
todoAdapter.changeCursor(todoCursor);
}
}
活動xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Top1" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="Top2" />
</LinearLayout>
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
如何將偵聽器添加到適配器xml中的按鈕?
在您已在ToDoCursorAdapter
類上覆蓋的bindView方法上創建一個按鈕對象,然后像在其余文本視圖中一樣使用findViewById來初始化該對象,此后,您需要添加onClickListner來執行預期的操作代碼(例如,隱藏textView)
public class ToDoCursorAdapter extends CursorAdapter {
public ToDoCursorAdapter(Context context, Cursor cursor) {
super(context, cursor, 0);
}
// The newView method is used to inflate a new view and return it,
// you don't bind any data to the view at this point.
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return LayoutInflater.from(context).inflate(R.layout.listview, parent, false);
}
@Override
public void bindView(View view, Context context, Cursor cursor) {
TextView engText = (TextView) view.findViewById(R.id.engText);
TextView arabText = (TextView) view.findViewById(R.id.arabText);
TextView refText = (TextView) view.findViewById(R.id.refText);
TextView refText = (TextView) view.findViewById(R.id.refText);
Button button = (Button) view.findViewById(R.id.button);
Button button2 = (Button) view.findViewById(R.id.button2);
String arabic = cursor.getString(cursor.getColumnIndexOrThrow("PlainArab_Text"));
String english = cursor.getString(cursor.getColumnIndexOrThrow("PlainEng_Text"));
String ref = cursor.getString(cursor.getColumnIndexOrThrow("REF"));
arabText.setText(arabic);
engText.setText(english);
refText.setText(ref);
//updated
arabText.setVisibility(View.VISIBLE);
engText.setVisibility(View.VISIBLE);
button.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v){
arabText.setVisibility(View.GONE);
}
});
button2.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v){
engText.setVisibility(View.GONE);
}
});
}
}
在您的bindView()
方法中,創建Button
對象並向其添加點擊偵聽器
@Override public void bindView(View view, Context context, Cursor cursor) {
Button button= (Button) findViewById(R.id.buttonId); button.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View v) {
//your code here
}
});
}
創建一個回調界面
public interface ButtonCallback{
void onClickButton(View v);
void onClickButton2(View v);
}
您的MainActivity實現了Callback接口
public class ListViewActivity extends Activity implements ButtonCallback{
....
public void onClickButton(View v){
// do something
}
public void onClickButton2(View v){
// do something
}
}
在您的適配器中,設置onclicklistener
@Override
public void bindView(View view, Context context, Cursor cursor) {
TextView engText = (TextView) view.findViewById(R.id.engText);
TextView arabText = (TextView) view.findViewById(R.id.arabText);
TextView refText = (TextView) view.findViewById(R.id.refText);
Button button = (TextView) view.findViewById(R.id.button);
Button button2 = (TextView) view.findViewById(R.id.button2);
String arabic = cursor.getString(cursor.getColumnIndexOrThrow("PlainArab_Text"));
String english = cursor.getString(cursor.getColumnIndexOrThrow("PlainEng_Text"));
String ref = cursor.getString(cursor.getColumnIndexOrThrow("REF"));
arabText.setText(arabic);
engText.setText(english);
refText.setText(ref);
button.setOnClickListenter(new View.OnClickListener({
public void onCLick(View v){
context.OnClickButton(v);
}
});
button2.setOnClickListenter(new View.OnClickListener({
public void onCLick(View v){
context.OnClickButton2(v);
}
});
}
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