Question

我无法运行我的Android应用程序进行调试。这是我第一次构建一个android应用程序，所以我不熟悉这个过程。我从LogCat

收到以下错误消息

07-30 22:48:35.626: E/Trace(744): error opening trace file: No such file or directory (2)
07-30 22:49:42.285: E/AndroidRuntime(744): FATAL EXCEPTION: main
07-30 22:49:42.285: E/AndroidRuntime(744): java.lang.IllegalStateException: Could not execute method of the activity
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.view.View$1.onClick(View.java:3599)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.view.View.performClick(View.java:4204)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.view.View$PerformClick.run(View.java:17355)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.os.Handler.handleCallback(Handler.java:725)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.os.Handler.dispatchMessage(Handler.java:92)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.os.Looper.loop(Looper.java:137)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.app.ActivityThread.main(ActivityThread.java:5041)
07-30 22:49:42.285: E/AndroidRuntime(744):  at java.lang.reflect.Method.invokeNative(Native Method)
07-30 22:49:42.285: E/AndroidRuntime(744):  at java.lang.reflect.Method.invoke(Method.java:511)
07-30 22:49:42.285: E/AndroidRuntime(744):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-30 22:49:42.285: E/AndroidRuntime(744):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-30 22:49:42.285: E/AndroidRuntime(744):  at dalvik.system.NativeStart.main(Native Method)
07-30 22:49:42.285: E/AndroidRuntime(744): Caused by: java.lang.reflect.InvocationTargetException
07-30 22:49:42.285: E/AndroidRuntime(744):  at java.lang.reflect.Method.invokeNative(Native Method)
07-30 22:49:42.285: E/AndroidRuntime(744):  at java.lang.reflect.Method.invoke(Method.java:511)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.view.View$1.onClick(View.java:3594)
07-30 22:49:42.285: E/AndroidRuntime(744):  ... 11 more
07-30 22:49:42.285: E/AndroidRuntime(744): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.wadi3mrad/com.example.wadi3mrad.biog}; have you declared this activity in your AndroidManifest.xml?
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1618)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.app.Activity.startActivityForResult(Activity.java:3370)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.app.Activity.startActivityForResult(Activity.java:3331)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.app.Activity.startActivity(Activity.java:3566)
07-30 22:49:42.285: E/AndroidRuntime(744):  at android.app.Activity.startActivity(Activity.java:3534)
07-30 22:49:42.285: E/AndroidRuntime(744):  at com.example.wadi3mrad.MainActivity.someFunction(MainActivity.java:55)
07-30 22:49:42.285: E/AndroidRuntime(744):  ... 14 more

代码

public class MainActivity extends Activity {



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
    WindowManager.LayoutParams.FLAG_FULLSCREEN);
    setContentView(R.layout.activity_main);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

}
public void someFunction(View v)
{
   Intent myIntentd= new Intent();
     switch (v.getId()) // get id of Button clicked
     {
         case (R.id.music):
         myIntentd = new Intent(getApplicationContext(),
                 Albums.class);
        break;
         case (R.id.bio):
         myIntentd = new Intent(getApplicationContext(),
                 biog.class);
         break;
         case (R.id.face):
         myIntentd = new Intent(getApplicationContext(),
                 faceboom.class);
         break;
         case (R.id.info_but):
         myIntentd = new Intent(getApplicationContext(),
                 info.class);
         break;
     }
   startActivity(myIntentd);
}



@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

Answer 1

没有任何代码，除了Jon Skeet之外，没有人可以告诉你问题出在哪里。但是从查看logcat开始，您尝试访问Array的元素，而不是Array

中的元素。

这一行

 Caused by: java.lang.ArrayIndexOutOfBoundsException: length=3; index=3

给出了一个例外，说你试图访问索引3，但是数组的大小是3，所以最高可能的索引是2，因为Array的基数为0。

此行（引用您的项目的异常之后的第一行）说明Activity中哪一行以及该行所用的方法

at com.example.wadi3mrad.MainActivity.addListenerOnButton(MainActivity.java:81)

MainActivity的第81行向listener添加Button。

我意识到这不是一个答案，但你知道他们说的是什么......“教一个人钓鱼......”

修改

让我们看看这是怎么回事。由于所有这些按钮几乎都做了一件事，更容易和更简洁的方法是在onClick函数声明xml中的所有这些按钮然后你不需要所有的监听器和按钮阵列。

在你的xml中，对于每个按钮，添加类似的内容
android:onClick="someFunction"

然后你只需要Java中的一个函数，而不需要所有其他的东西。所以你的Java代码看起来像

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_main); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); } public void someFunction(View v) { Intent myIntent = new Intent(); switch (v.getId()) // get id of Button clicked { case (R.id.music): myIntent = new Intent(MainActivity.this, Albums.class); break; case (R.id.bio): myIntent = new Intent(MainActivity.this, biog.class); break; case (R.id.face): myIntent = new Intent(MainActivity.this, faceboom.class); break; case (R.id.info_but): myIntent = new Intent(MainActivity.this, info.class); break; } startActivity(myIntent); }

不幸的是我的应用已停止

1 个答案: