Question

从我的启动画面开始我的主活动课程。

主要活动包含一个图像按钮，我通过显式意图调用其他类（第二个屏幕）。

但是现在SpleshScreen时间结束后我强行关闭，但当我删除MainActivity的显式意图代码时。

在Splesh Screen之后。我以完美的方式获得了我的MainActivity。＆gt;（但是因为我必须进入SecondScreen我把explict的代码放在Intent中）

我想要像SpleshScreen-＆gt; MainActivity-＆gt; SecondScreen

这样的流程

我的LogCat显示以下错误

07-13 12:14:59.192: ERROR/AndroidRuntime(2455): Uncaught handler: thread main exiting due to uncaught exception
07-13 12:14:59.192: ERROR/AndroidRuntime(2455): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.app/com.example.app.MainActivity}: java.lang.ClassCastException: android.widget.ImageButton
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2558)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2574)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at android.app.ActivityThread.access$2400(ActivityThread.java:121)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1925)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at android.os.Looper.loop(Looper.java:136)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at android.app.ActivityThread.main(ActivityThread.java:4425)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at java.lang.reflect.Method.invokeNative(Native Method)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at java.lang.reflect.Method.invoke(Method.java:521)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at dalvik.system.NativeStart.main(Native Method)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455): Caused by: java.lang.ClassCastException: android.widget.ImageButton
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at com.rvappstudios.fingerslayarrr.MainActivity.onCreate(MainActivity.java:24)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2521)
07-13 12:14:59.192: ERROR/AndroidRuntime(2455):     ... 11 more
07-13 12:14:59.200: ERROR/ActivityManager(1188): SIGNAL_QUIT: to crashed process 2455

我的MainActivity.java代码的imagebutton来调用我的秒屏

  public class MainActivity extends Activity 
{
    private Button play;

    //Called when first activity is created
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main1);

        play=(Button)findViewById(R.id.down);
        play.setOnClickListener(new OnClickListener() 
        {

            @Override
            public void onClick(View v)
            {
                Intent intent=new Intent(MainActivity.this,SecondScreen.class);

                startActivity(intent);


            }
        });

    }
}

我的清单文件代码

<activity android:name=".SplashScreen"
              android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
              android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <activity android:name="MainActivity" 
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
   android:screenOrientation="portrait" >
   <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
  </activity>

   <activity android:name="SecondScreen" 
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
   android:screenOrientation="portrait" >
</activity>

Answer 1

发布MainActivity的源代码及其layout.xml。或者参考MainActivity中的第24行。存在类型不匹配。

Answer 2

疯狂猜测。

Caused by: java.lang.ClassCastException: android.widget.ImageButton

但你有

private Button play;
play=(Button)findViewById(R.id.down);

你在xml中有Button或ImageButton吗？

无法启动活动： - 显式意图问题

2 个答案: