解决方案
我只使用setContentView(R.layout.menu);我还需要setContentView(R.layout.l2class);
原始问题
我有加载屏幕＆gt;菜单＆gt; menu_2。当我选择menu_2时，我有错误。 My process stopped
package com.lineage.goddess;
public class l2class extends Activity {
private static final int SHOW_1 = 1;
private static final int SHOW_2 = 2;
private static final int SHOW_3 = 3;
private static final int SHOW_4 = 4;
private static final int SHOW_5 = 5;
private static final int SHOW_6 = 6;
private static final int SHOW_7 = 7;
private static final int SHOW_8 = 8;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.menu);
Button act8 = (Button)findViewById(R.id.button8);
act8.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(l2class.this, wynnsummoner.class);
startActivityForResult(i, SHOW_8);
}
});
Button act7 = (Button)findViewById(R.id.button7);
act7.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(l2class.this, eolhhealer.class);
startActivityForResult(i, SHOW_7);
}
});
Button act6 = (Button)findViewById(R.id.button6);
act6.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(l2class.this, sigelknight.class);
startActivityForResult(i, SHOW_6);
}
});
Button act5 = (Button)findViewById(R.id.button5);
act5.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(l2class.this, isenchanter.class);
startActivityForResult(i, SHOW_5);
}
});
Button act4 = (Button)findViewById(R.id.button4);
act4.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(l2class.this, othelrogue.class);
startActivityForResult(i, SHOW_4);
}
});
Button act3 = (Button)findViewById(R.id.button3);
act3.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(l2class.this, tirwarrior.class);
startActivityForResult(i, SHOW_3);
}
});
Button act2 = (Button)findViewById(R.id.button2);
act2.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(l2class.this, yrarcher.class);
startActivityForResult(i, SHOW_2);
}
});
Button act1 = (Button)findViewById(R.id.button1);
act1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(l2class.this, feohwizard.class);
startActivityForResult(i, SHOW_1);
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
switch (requestCode) {
case SHOW_1://case show_1
break;
case SHOW_2://case show_2
break;
case SHOW_3://case show_3
break;
case SHOW_4://case show_4
break;
case SHOW_5://case show_5
break;
case SHOW_6://case show_6
break;
case SHOW_7://case show_7
break;
case SHOW_8://case show_8
break;
}//switch
}//if result_ok
}//onactivityresult
//TODO: Fill In Methods Etc.
}//class
菜单1：
package com.lineage.goddess;
public class menu extends Activity {
private static final int SHOW_1 = 1;
private static final int SHOW_2 = 2;
private static final int SHOW_3 = 3;
private static final int SHOW_4 = 4;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.menu);
Button act4 = (Button)findViewById(R.id.button2);
act4.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(menu.this, l2class.class);
startActivityForResult(i, SHOW_4);
}
});
Button act3 = (Button)findViewById(R.id.button3);
act3.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(menu.this, location.class);
startActivityForResult(i, SHOW_3);
}
});
Button act2 = (Button)findViewById(R.id.button4);
act2.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(menu.this, help.class);
startActivityForResult(i, SHOW_2);
}
});
Button act1 = (Button)findViewById(R.id.button1);
act1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent i = new Intent(menu.this, room.class);
startActivityForResult(i, SHOW_1);
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
switch (requestCode) {
case SHOW_1://case show_1
break;
case SHOW_2://case show_2
break;
case SHOW_3://case show_3
break;
case SHOW_4://case show_4
break;
}//switch
}//if result_ok
}//onactivityresult
}//class
Logcat：
12-22 22:19:12.493: E/AndroidRuntime(300): FATAL EXCEPTION: main
12-22 22:19:12.493: E/AndroidRuntime(300): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lineage.goddess/com.lineage.goddess.l2class}: java.lang.NullPointerException
12-22 22:19:12.493: E/AndroidRuntime(300): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lineage.goddess/com.lineage.goddess.l2class}: java.lang.NullPointerException
12-22 22:19:12.493: E/AndroidRuntime(300): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
12-22 22:19:12.493: E/AndroidRuntime(300): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
12-22 22:19:12.493: E/AndroidRuntime(300): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
12-22 22:19:12.493: E/AndroidRuntime(300): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
12-22 22:19:12.493: E/AndroidRuntime(300): at android.os.Handler.dispatchMessage(Handler.java:99)
12-22 22:19:12.493: E/AndroidRuntime(300): at android.os.Looper.loop(Looper.java:123)
12-22 22:19:12.493: E/AndroidRuntime(300): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-22 22:19:12.493: E/AndroidRuntime(300): at java.lang.reflect.Method.invokeNative(Native Method)
12-22 22:19:12.493: E/AndroidRuntime(300): at java.lang.reflect.Method.invoke(Method.java:521)
12-22 22:19:12.493: E/AndroidRuntime(300): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-22 22:19:12.493: E/AndroidRuntime(300): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-22 22:19:12.493: E/AndroidRuntime(300): at dalvik.system.NativeStart.main(Native Method)
12-22 22:19:12.493: E/AndroidRuntime(300): Caused by: java.lang.NullPointerException
12-22 22:19:12.493: E/AndroidRuntime(300): at com.lineage.goddess.l2class.onCreate(l2class.java:32)
12-22 22:19:12.493: E/AndroidRuntime(300): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-22 22:19:12.493: E/AndroidRuntime(300): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
12-22 22:19:12.493: E/AndroidRuntime(300): ... 11 more
答案 0 :(得分：0)
你能告诉我你代码中的32行是什么吗？正如我的猜测act8未正确创建可能是它找不到R.id.button8，这就是你获得例外的原因。