主要的事情發生在致命的執行我的應用程序不啓動,並出現錯誤不幸停止它不斷崩潰 嘗試開關的情況下,如果仍然錯誤繼續應用程序不斷崩潰 谷歌搜索和搜索over stackflow不同用戶stackovered面臨這個錯誤仍然錯誤仍然繼續與我,即使嘗試他們的解決方案與單個如果和單個onclicklistener應用程序管理運行,但不與多個onlicklistener是有不同的方式來運行多個onclick監聽器應用程序,請幫助我使用多個OnClickListeners我得到致命異常
Here's MainActivity.java
package com.example.cricscore;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
// Private member field to keep track of the count
private int mCount = 0;
private static final String TAG = "MainActivity";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button buttonA = (Button) findViewById(R.id.button1);
buttonA.setOnClickListener((OnClickListener) this);
Button buttonB = (Button) findViewById(R.id.button2);
buttonB.setOnClickListener((OnClickListener) this);
}
public void onClick(View v) {
try {
switch (v.getId()) {
case R.id.button1:
mCount++;
final TextView countTextView = (TextView) findViewById(R.id.textView1);
countTextView.setText(""+ mCount);
break;
case R.id.button2:
mCount= mCount+2 ;
final TextView countTextView1 = (TextView) findViewById(R.id.textView1);
countTextView1.setText(""+ mCount);
break;
}
}
catch(Throwable t) {
Log.e(TAG, t.getMessage(), t);
}
}
}
而且activity_main.xml中是
<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"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignRight="@+id/button2"
android:layout_below="@+id/textView1"
android:text="Runs" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView3"
android:layout_alignBottom="@+id/textView3"
android:layout_alignRight="@+id/textView2"
android:layout_marginRight="19dp"
android:text="Wickets" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView4"
android:layout_alignParentRight="true"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView3"
android:text="1" />
<Button
android:id="@+id/button2"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button1"
android:layout_alignBottom="@+id/button1"
android:layout_toRightOf="@+id/button1"
android:text="2" />
<Button
android:id="@+id/button4"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/button1"
android:text="6" />
<Button
android:id="@+id/button6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/button5"
android:layout_alignRight="@+id/textView4"
android:text="Wicket" />
<Button
android:id="@+id/button7"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button8"
android:layout_alignBottom="@+id/button8"
android:layout_alignLeft="@+id/button5"
android:text="Balls" />
<Button
android:id="@+id/button3"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView3"
android:layout_toRightOf="@+id/button7"
android:text="4" />
<Button
android:id="@+id/button8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="44dp"
android:layout_toLeftOf="@+id/textView2"
android:text="Button" />
<Button
android:id="@+id/button5"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button4"
android:layout_alignBottom="@+id/button4"
android:layout_toLeftOf="@+id/textView7"
android:text="No/Wide" />
<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView7"
android:layout_alignBottom="@+id/textView7"
android:layout_alignRight="@+id/button5"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/button8"
android:layout_toLeftOf="@+id/textView4"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
</RelativeLayout>
logcat的
03-18 14:09:37.717: E/AndroidRuntime(360): FATAL EXCEPTION: main
03-18 14:09:37.717: E/AndroidRuntime(360): java.lang.RuntimeException: Unable to start
activity
ComponentInfo{com.example.abc/com.example.abc.MainActivity}: java.lang.ClassCastException:
com.example.abc.MainActivity
03-18 14:09:37.717: E/AndroidRuntime(360): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
03-18 14:09:37.717: E/AndroidRuntime(360): at
android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:1663)
03-18 14:09:37.717: E/AndroidRuntime(360): at android.app.ActivityThread.access$1500
(ActivityThread.java:117)
03-18 14:09:37.717: E/AndroidRuntime(360): at android.app.ActivityThread$H.handleMessage
(ActivityThread.java:931)
03-18 14:09:37.717: E/AndroidRuntime(360): at android.os.Handler.dispatchMessage
(Handler.java:99)
03-18 14:09:37.717: E/AndroidRuntime(360): at android.os.Looper.loop(Looper.java:123)
03-18 14:09:37.717: E/AndroidRuntime(360): at android.app.ActivityThread.main
(ActivityThread.java:3683)
03-18 14:09:37.717: E/AndroidRuntime(360): at java.lang.reflect.Method.invokeNative(Native
Method)
03-18 14:09:37.717: E/AndroidRuntime(360): at java.lang.reflect.Method.invoke
(Method.java:507)
03-18 14:09:37.717: E/AndroidRuntime(360): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-18 14:09:37.717: E/AndroidRuntime(360): at com.android.internal.os.ZygoteInit.main
(ZygoteInit.java:597)
03-18 14:09:37.717: E/AndroidRuntime(360): at dalvik.system.NativeStart.main(Native Method)
03-18 14:09:37.717: E/AndroidRuntime(360): Caused by: java.lang.ClassCastException:
com.example.abc.MainActivity
03-18 14:09:37.717: E/AndroidRuntime(360): at com.example.abc.MainActivity.onCreate
(MainActivity.java:30)
03-18 14:09:37.717: E/AndroidRuntime(360): at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-18 14:09:37.717: E/AndroidRuntime(360): at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
03-18 14:09:37.717: E/AndroidRuntime(360): ... 11 more
一些修改,至於說通過第1回答我的代碼沒有崩潰,但我只能看到空白的活動,其中後android_mainfest仍然是相同的
package com.example.cricscore;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener {
// Private member field to keep track of the count
private int mCount = 0;
/** Called when the activity is first created.
* @param OnClickListener */
public void onCreate(Bundle savedInstanceState, android.view.View.OnClickListener
OnClickListener){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button buttonA = (Button) findViewById(R.id.button1);
buttonA.setOnClickListener((OnClickListener));
Button buttonB = (Button) findViewById(R.id.button2);
buttonB.setOnClickListener((OnClickListener));
}
public void OnClickListener(View v) {
switch (v.getId()) {
case R.id.button1:
mCount++;
final TextView countTextView = (TextView) findViewById(R.id.textView1);
countTextView.setText(""+ mCount);
break;
case R.id.button2:
mCount= mCount+2 ;
final TextView countTextView1 = (TextView) findViewById(R.id.textView1);
countTextView1.setText(""+ mCount);
break;
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}
嗨,歡迎來到Stack Overflow。如果您能夠將問題切入問題的根源,那麼獲得幫助就容易多了。避免粘貼大量代碼,因爲這隻會讓人們難以發現問題。 – SWeko 2013-03-18 12:44:52