我是android新手。我想问你一些问题。
当我通过命令从主活动调用新活动时
Intent myIntent = new Intent(v.getContext(), PolarView.class);
//startActivityForResult(myIntent, 0);
startActivityForResult(myIntent, 0);
finish();
然后在新活动中我不能做任何动作，例如例如按钮单击
两个
Button btnSeven = (Button) this.findViewById(R.id.btn7);
btnSeven.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
InputStr = InputStr + "7";
InputViewField.setText(InputStr);
}
});
}
和
public void btn7_click(View v) {
InputStr = InputStr + "7";
InputViewField.setText(InputStr);
}
在活动布局中定义了android：onClick =“btn7_click” 其中InputViewField是EditText对象
在第一种情况下，新活动无法启动，在第二种情况下，当我按下此按钮时，应用程序崩溃。
你可以帮我吗？这是改变后logcat的最后一个和平
StartActivityForResult()
到
StartActivity()
logcat的：
D/MediaScanner( 153): opendir /system/media/ failed, errno: 2
D/MediaScanner( 153): prescan time: 25225ms
D/MediaScanner( 153): scan time: 162ms
D/MediaScanner( 153): postscan time: 48ms
D/dalvikvm( 109): GC freed 1920 objects / 95640 bytes in 160ms
D/MediaScanner( 153): total time: 25435ms
D/MediaScannerService( 153): done scanning volume internal
D/MediaScannerService( 153): start scanning volume external
D/dalvikvm( 52): GREF has increased to 301
I/ActivityManager( 52): Starting activity: Intent { cmp=complex.ComplexCalc/.PolarView }
I/ActivityManager( 52): Displayed activity complex.ComplexCalc/.PolarView: 1414 ms (total 1414 ms)
V/MediaScanner( 153): pruneDeadThumbnailFiles... android.database.sqlite.SQLiteCursor@43bc30b8
V/MediaScanner( 153): /pruneDeadThumbnailFiles... android.database.sqlite.SQLiteCursor@43bc30b8
D/MediaScanner( 153): prescan time: 1509ms
D/MediaScanner( 153): scan time: 405ms
D/MediaScanner( 153): postscan time: 323ms
D/MediaScanner( 153): total time: 2237ms
D/MediaScannerService( 153): done scanning volume external
D/AndroidRuntime( 223): Shutting down VM
W/dalvikvm( 223): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
E/AndroidRuntime( 223): Uncaught handler: thread main exiting due to uncaught exception
D/dalvikvm( 223): GC freed 3456 objects / 221888 bytes in 153ms
E/AndroidRuntime( 223): java.lang.IllegalStateException: Could not execute method of the activity
E/AndroidRuntime( 223): at android.view.View$1.onClick(View.java:2031)
E/AndroidRuntime( 223): at android.view.View.performClick(View.java:2364)
E/AndroidRuntime( 223): at android.view.View.onTouchEvent(View.java:4179)
E/AndroidRuntime( 223): at android.widget.TextView.onTouchEvent(TextView.java:6541)
E/AndroidRuntime( 223): at android.view.View.dispatchTouchEvent(View.java:3709)
E/AndroidRuntime( 223): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
E/AndroidRuntime( 223): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
E/AndroidRuntime( 223): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
E/AndroidRuntime( 223): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
E/AndroidRuntime( 223): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
E/AndroidRuntime( 223): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
E/AndroidRuntime( 223): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
E/AndroidRuntime( 223): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
E/AndroidRuntime( 223): at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
E/AndroidRuntime( 223): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
E/AndroidRuntime( 223): at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
E/AndroidRuntime( 223): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 223): at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime( 223): at android.app.ActivityThread.main(ActivityThread.java:4363)
E/AndroidRuntime( 223): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 223): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 223): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
E/AndroidRuntime( 223): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
E/AndroidRuntime( 223): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 223): Caused by: java.lang.reflect.InvocationTargetException
E/AndroidRuntime( 223): at complex.ComplexCalc.PolarView.btn7_click(PolarView.java:266)
E/AndroidRuntime( 223): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 223): at java.lang.reflect.Method.invoke(Method.java:521)
E/AndroidRuntime( 223): at android.view.View$1.onClick(View.java:2026)
E/AndroidRuntime( 223): ... 23 more
E/AndroidRuntime( 223): Caused by: java.lang.NullPointerException
E/AndroidRuntime( 223): ... 27 more
I/Process ( 52): Sending signal. PID: 223 SIG: 3
I/dalvikvm( 223): threadid=7: reacting to signal 3
I/dalvikvm( 223): Wrote stack trace to '/data/anr/traces.txt'
I/ARMAssembler( 52): generated scanline__00000077:03515104_00000000_00000000 [ 33 ipp] (47 ins) at [0x46eae8:0x46eba4] in 1562593 ns
I/ARMAssembler( 52): generated scanline__00000177:03515104_00001001_00000000 [ 91 ipp] (114 ins) at [0x46eba8:0x46ed70] in 1903198 ns
I/Process ( 223): Sending signal. PID: 223 SIG: 9
I/ActivityManager( 52): Process complex.ComplexCalc (pid 223) has died.
I/WindowManager( 52): WIN DEATH: Window{43cc3920 complex.ComplexCalc/complex.ComplexCalc.PolarView paused=false}
E/gralloc ( 52): [unregister] handle 0x481778 still locked (state=40000001)
I/UsageStats( 52): Unexpected resume of com.android.launcher while already resumed in complex.ComplexCalc
W/InputManagerService( 52): Got RemoteException sending setActive(false) notification to pid 223 uid 10024
答案 0 :(得分：0)
我认为你的部分问题是你正在使用startActivityForResult（..），实际上你应该使用startActivity（..），因为你的新活动可能没有返回任何东西。
但是，如果没有错误记录，很难说出真正发生的事情