10-26 13:08:03.050: E/AndroidRuntime(216): Uncaught handler: thread main exiting due to uncaught exception
10-26 13:08:03.070: E/AndroidRuntime(216): java.lang.RuntimeException: Unable to start activity ComponentInfo{edu.xidian02/edu.xidian02.OtherActivity}: java.lang.NullPointerException
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.os.Handler.dispatchMessage(Handler.java:99)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.os.Looper.loop(Looper.java:123)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.main(ActivityThread.java:4203)
10-26 13:08:03.070: E/AndroidRuntime(216): at java.lang.reflect.Method.invokeNative(Native Method)
10-26 13:08:03.070: E/AndroidRuntime(216): at java.lang.reflect.Method.invoke(Method.java:521)
10-26 13:08:03.070: E/AndroidRuntime(216): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
10-26 13:08:03.070: E/AndroidRuntime(216): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
10-26 13:08:03.070: E/AndroidRuntime(216): at dalvik.system.NativeStart.main(Native Method)
10-26 13:08:03.070: E/AndroidRuntime(216): Caused by: java.lang.NullPointerException
10-26 13:08:03.070: E/AndroidRuntime(216): at edu.xidian02.OtherActivity.onCreate(OtherActivity.java:18)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
10-26 13:08:03.070: E/AndroidRuntime(216): ... 11 more
源码:
package edu.xidian02;import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;public class myActivity extends Activity {
/** Called when the activity is first created. */
private Button myButton=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton=(Button)findViewById(R.id.myButton);
myButton.setOnClickListener(new MyButtonListener());
}
class MyButtonListener implements OnClickListener, android.view.View.OnClickListener{
public void onClick(View v){
Intent intent=new Intent();
//intent.putExtra("abc", "cuijin");
intent.setClass(myActivity.this,OtherActivity.class);
myActivity.this.startActivity(intent);
}
public void add(){}
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}
}package edu.xidian02;import android.app.Activity;
//import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;public class OtherActivity extends Activity { private TextView myTextView=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//Intent intent=getIntent();
//String value=intent.getStringExtra("abc");
myTextView=(TextView)findViewById(R.id.myTextView);
myTextView.setText("nihao");
}}
10-26 13:08:03.070: E/AndroidRuntime(216): java.lang.RuntimeException: Unable to start activity ComponentInfo{edu.xidian02/edu.xidian02.OtherActivity}: java.lang.NullPointerException
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.os.Handler.dispatchMessage(Handler.java:99)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.os.Looper.loop(Looper.java:123)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.main(ActivityThread.java:4203)
10-26 13:08:03.070: E/AndroidRuntime(216): at java.lang.reflect.Method.invokeNative(Native Method)
10-26 13:08:03.070: E/AndroidRuntime(216): at java.lang.reflect.Method.invoke(Method.java:521)
10-26 13:08:03.070: E/AndroidRuntime(216): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
10-26 13:08:03.070: E/AndroidRuntime(216): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
10-26 13:08:03.070: E/AndroidRuntime(216): at dalvik.system.NativeStart.main(Native Method)
10-26 13:08:03.070: E/AndroidRuntime(216): Caused by: java.lang.NullPointerException
10-26 13:08:03.070: E/AndroidRuntime(216): at edu.xidian02.OtherActivity.onCreate(OtherActivity.java:18)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
10-26 13:08:03.070: E/AndroidRuntime(216): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
10-26 13:08:03.070: E/AndroidRuntime(216): ... 11 more
源码:
package edu.xidian02;import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;public class myActivity extends Activity {
/** Called when the activity is first created. */
private Button myButton=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton=(Button)findViewById(R.id.myButton);
myButton.setOnClickListener(new MyButtonListener());
}
class MyButtonListener implements OnClickListener, android.view.View.OnClickListener{
public void onClick(View v){
Intent intent=new Intent();
//intent.putExtra("abc", "cuijin");
intent.setClass(myActivity.this,OtherActivity.class);
myActivity.this.startActivity(intent);
}
public void add(){}
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
}
}package edu.xidian02;import android.app.Activity;
//import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;public class OtherActivity extends Activity { private TextView myTextView=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//Intent intent=getIntent();
//String value=intent.getStringExtra("abc");
myTextView=(TextView)findViewById(R.id.myTextView);
myTextView.setText("nihao");
}}
解决方案 »
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