在我的列表视图中，如果我单击它必须获取列表视图 ID 的按钮，我已经放置了一个按钮，但是在单击该按钮后应用程序已停止。
如果我们点击按钮，它已经获取了 id，它必须发送 id。但是现在点击按钮后，它会显示“您的应用程序已停止”
public class MainActivity extends Activity implements FetchDataListener,OnClickListener
{
private static final int ACTIVITY_CREATE=0;
private ProgressDialog dialog;
ListView lv;
ListView lv1;
private List<Application> items;
private Button btnGetSelected;
private Button praycount;
public int pct;
private String stringVal;
private TextView value;
private int prayers;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_item);
lv1 =(ListView)findViewById(R.id.list);
lv =(ListView)findViewById(R.id.list);
btnGetSelected = (Button) findViewById(R.id.btnget);
btnGetSelected.setOnClickListener(this);
initView();
}
private void initView()
{
// show progress dialog
dialog = ProgressDialog.show(this, "", "Loading...");
String url = "http://www.ginfy.com/api/v1/posts.json";
FetchDataTask task = new FetchDataTask(this);
task.execute(url);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater mi = getMenuInflater();
mi.inflate(R.menu.activity_main, menu);
return true;
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
createProject();
return super.onMenuItemSelected(featureId, item);
}
private void createProject() {
Intent i = new Intent(this, AddPrayerActivity.class);
startActivityForResult(i, ACTIVITY_CREATE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
initView();
}
@Override
public void onFetchComplete(List<Application> data)
{
this.items = data;
// dismiss the progress dialog
if ( dialog != null )
dialog.dismiss();
// create new adapter
ApplicationAdapter adapter = new ApplicationAdapter(this, data);
// set the adapter to list
lv.setAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
CheckBox chk = (CheckBox) view.findViewById(R.id.checkbox);
Application bean = items.get(position);
if (bean.isSelected()) {
bean.setSelected(false);
chk.setChecked(false);
} else {
bean.setSelected(true);
chk.setChecked(true);
}
}
});
}
// Toast is here...
private void showToast(String msg) {
Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();
}
@Override
public void onFetchFailure(String msg)
{
// dismiss the progress dialog
if ( dialog != null )
dialog.dismiss();
// show failure message
Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
}
@Override
public void onClick(View v) {
StringBuffer sb = new StringBuffer();
// Retrive Data from list
for (Application bean : items) {
if (bean.isSelected()) {
sb.append("Title:");
sb.append(Html.fromHtml(bean.getTitle()));
sb.append(",Content:");
sb.append(Html.fromHtml(bean.getContent()));
sb.append("\n");
}
}
showAlertView(sb.toString().trim());
}
public void onPrayComplete(List<Application> data)
{
this.items = data;
// dismiss the progress dialog
if ( dialog != null )
dialog.dismiss();
// create new adapter
ApplicationAdapter adapter = new ApplicationAdapter(this, data);
// set the adapter to list
lv1.setAdapter(adapter);
lv1 .setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Button pct = (Button) view.findViewById(R.id.pray);
//Application bean1 = items.get(position);
Object o = items.get(position);
Application obj_itemDetails = (Application)o;
Integer prayers = obj_itemDetails.getId();
}
});
}
public void pray(View v) {
//showAlertView(sb.toString().trim());
praydata(Integer.parseInt("prayers"));
}
public void praydata(int i) {
// Create a new HttpClient and Post Header.
String url= "http://www.ginfy.com/api/v1/posts/"+i+".json";
dialog = ProgressDialog.show(this, "", "Loading...");
FetchDataTask task = new FetchDataTask(this);
task.execute(url);
}
这是显示的 logcat。
06-19 11:16:31.645: E/AndroidRuntime(3481): FATAL EXCEPTION: main
06-19 11:16:31.645: E/AndroidRuntime(3481): java.lang.IllegalStateException: Could not find a method pray(View) in the activity class com.example.jsonandroid.MainActivity for onClick handler on view class android.widget.Button with id 'pray'
06-19 11:16:31.645: E/AndroidRuntime(3481): at android.view.View$1.onClick(View.java:3584)
06-19 11:16:31.645: E/AndroidRuntime(3481): at android.view.View.performClick(View.java:4202)
06-19 11:16:31.645: E/AndroidRuntime(3481): at android.view.View$PerformClick.run(View.java:17340)
06-19 11:16:31.645: E/AndroidRuntime(3481): at android.os.Handler.handleCallback(Handler.java:725)
06-19 11:16:31.645: E/AndroidRuntime(3481): at android.os.Handler.dispatchMessage(Handler.java:92)
06-19 11:16:31.645: E/AndroidRuntime(3481): at android.os.Looper.loop(Looper.java:137)
06-19 11:16:31.645: E/AndroidRuntime(3481): at android.app.ActivityThread.main(ActivityThread.java:5039)
06-19 11:16:31.645: E/AndroidRuntime(3481): at java.lang.reflect.Method.invokeNative(Native Method)
06-19 11:16:31.645: E/AndroidRuntime(3481): at java.lang.reflect.Method.invoke(Method.java:511)
06-19 11:16:31.645: E/AndroidRuntime(3481): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-19 11:16:31.645: E/AndroidRuntime(3481): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-19 11:16:31.645: E/AndroidRuntime(3481): at dalvik.system.NativeStart.main(Native Method)
06-19 11:16:31.645: E/AndroidRuntime(3481): Caused by: java.lang.NoSuchMethodException: pray [class android.view.View]
06-19 11:16:31.645: E/AndroidRuntime(3481): at java.lang.Class.getConstructorOrMethod(Class.java:460)
06-19 11:16:31.645: E/AndroidRuntime(3481): at java.lang.Class.getMethod(Class.java:915)
06-19 11:16:31.645: E/AndroidRuntime(3481): at android.view.View$1.onClick(View.java:3577)
06-19 11:16:31.645: E/AndroidRuntime(3481): ... 11 more
这是我的祈祷按钮 xml 文件 activity_row.xml 的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="@color/Light_Gray" >
<TextView
android:id="@+id/text2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_margin="5dp"
android:textColor="@android:color/black"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="@+id/text1"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_below="@+id/text2"
android:layout_margin="5dp"
android:textColor="@android:color/black"
android:textSize="15sp"
android:textStyle="bold" />
<TextView
android:id="@+id/count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@+id/checkbox"
android:layout_marginRight="20dip" />
<Button
android:id="@+id/pray"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/count"
android:layout_marginTop="30dip"
android:layout_toLeftOf="@+id/checkbox"
android:text="Pray"
android:background="@drawable/pray"
android:onClick="pray"
android:clickable="true" />
<CheckBox
android:id="@+id/checkbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="10dip"
android:background="@drawable/chk"
android:button="@null"
android:focusable="false"
android:focusableInTouchMode="false" />
</RelativeLayout>