java - 从 MainActivity 中的 onCreate() 启动另一个 Activity？

标签 java android android-intent android-activity logcat

我遇到的问题是我的 MainActivity 中的 onCreate() 方法似乎无法启动另一个 Activity 。

我的代码可以正常工作，这样当我单击一个按钮时，我的“AboutActivity”就会启动。但是，我想让它在 MainActivity 中的 onCreate() 完成后立即启动“AboutActivity”。

当我尝试从 onCreate() 启动“AboutActivity”时运行该程序时，该程序陷入空白屏幕。

发布的代码是问题的简化版本。本质上，这就是我想要做的。

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.activity_main);

        // Fire the intent that launches the "About" screen.
        Intent aboutScreen = new Intent(getBaseContext(), AboutActivity.class);
        this.startActivity(aboutScreen);
    }

AboutActivity 类的代码:

public class AboutActivity extends MainActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_about);
    }

    @Override
    public void onPause() {
        super.onPause();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        return super.onCreateOptionsMenu(menu);
    }
}

LogCat 消息是:

11-16 16:33:47.335: D/dalvikvm(1702): GC_FOR_ALLOC freed 65K, 7% free 2692K/2876K, paused 70ms, total 72ms
11-16 16:33:47.335: I/dalvikvm-heap(1702): Grow heap (frag case) to 3.347MB for 635812-byte allocation
11-16 16:33:47.435: D/dalvikvm(1702): GC_FOR_ALLOC freed 2K, 6% free 3310K/3500K, paused 98ms, total 98ms
11-16 16:33:47.715: D/dalvikvm(1702): GC_FOR_ALLOC freed 20K, 4% free 3469K/3608K, paused 28ms, total 29ms
11-16 16:33:47.735: I/dalvikvm-heap(1702): Grow heap (frag case) to 5.478MB for 2073616-byte allocation
11-16 16:33:47.845: D/dalvikvm(1702): GC_FOR_ALLOC freed 1K, 3% free 5493K/5636K, paused 112ms, total 112ms
11-16 16:33:48.175: I/Choreographer(1702): Skipped 36 frames!  The application may be doing too much work on its main thread.
11-16 16:33:48.465: D/libEGL(1702): loaded /system/lib/egl/libEGL_emulation.so
11-16 16:33:48.555: D/(1702): HostConnection::get() New Host Connection established 0x2a210280, tid 1702
11-16 16:33:48.604: D/libEGL(1702): loaded /system/lib/egl/libGLESv1_CM_emulation.so
11-16 16:33:48.615: D/libEGL(1702): loaded /system/lib/egl/libGLESv2_emulation.so
11-16 16:33:48.715: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:33:48.725: D/OpenGLRenderer(1702): Enabling debug mode 0
11-16 16:33:51.794: D/dalvikvm(1702): GC_FOR_ALLOC freed 139K, 4% free 6352K/6608K, paused 38ms, total 46ms
11-16 16:33:53.135: D/dalvikvm(1702): GREF has increased to 201
11-16 16:33:55.315: D/dalvikvm(1702): GC_FOR_ALLOC freed 219K, 5% free 7420K/7756K, paused 58ms, total 64ms
11-16 16:34:00.825: D/dalvikvm(1702): GC_FOR_ALLOC freed 281K, 5% free 8778K/9176K, paused 131ms, total 133ms
11-16 16:34:00.955: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:01.405: I/Choreographer(1702): Skipped 31 frames!  The application may be doing too much work on its main thread.
11-16 16:34:01.635: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:02.295: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:03.026: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:03.625: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:04.246: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:04.875: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:05.557: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:06.206: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:06.675: D/dalvikvm(1702): GREF has increased to 301
11-16 16:34:06.816: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:07.458: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:07.978: I/Choreographer(1702): Skipped 30 frames!  The application may be doing too much work on its main thread.
11-16 16:34:08.296: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:08.975: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:09.686: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:10.315: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:10.945: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:13.094: D/dalvikvm(1702): GC_FOR_ALLOC freed 367K, 5% free 10460K/10944K, paused 124ms, total 128ms
11-16 16:34:16.446: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:16.965: I/Choreographer(1702): Skipped 30 frames!  The application may be doing too much work on its main thread.
11-16 16:34:17.125: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:17.625: I/Choreographer(1702): Skipped 30 frames!  The application may be doing too much work on its main thread.
11-16 16:34:17.827: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:18.355: I/Choreographer(1702): Skipped 32 frames!  The application may be doing too much work on its main thread.
11-16 16:34:18.555: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:19.145: I/Choreographer(1702): Skipped 34 frames!  The application may be doing too much work on its main thread.
11-16 16:34:19.358: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:20.103: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:20.615: I/Choreographer(1702): Skipped 34 frames!  The application may be doing too much work on its main thread.
11-16 16:34:20.880: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:22.825: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:23.445: I/Choreographer(1702): Skipped 35 frames!  The application may be doing too much work on its main thread.
11-16 16:34:23.675: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:24.195: D/dalvikvm(1702): GC_FOR_ALLOC freed 381K, 4% free 12129K/12628K, paused 289ms, total 291ms
11-16 16:34:24.355: I/Choreographer(1702): Skipped 40 frames!  The application may be doing too much work on its main thread.
11-16 16:34:24.585: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:25.215: I/Choreographer(1702): Skipped 36 frames!  The application may be doing too much work on its main thread.
11-16 16:34:25.496: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:26.025: I/Choreographer(1702): Skipped 30 frames!  The application may be doing too much work on its main thread.
11-16 16:34:26.235: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:26.735: D/dalvikvm(1702): GREF has increased to 401
11-16 16:34:26.795: I/Choreographer(1702): Skipped 32 frames!  The application may be doing too much work on its main thread.
11-16 16:34:27.006: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:29.516: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:30.075: I/Choreographer(1702): Skipped 37 frames!  The application may be doing too much work on its main thread.
11-16 16:34:30.305: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:30.825: I/Choreographer(1702): Skipped 31 frames!  The application may be doing too much work on its main thread.
11-16 16:34:31.046: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:31.595: I/Choreographer(1702): Skipped 32 frames!  The application may be doing too much work on its main thread.
11-16 16:34:31.816: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:32.385: I/Choreographer(1702): Skipped 34 frames!  The application may be doing too much work on its main thread.
11-16 16:34:32.615: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:33.145: I/Choreographer(1702): Skipped 31 frames!  The application may be doing too much work on its main thread.
11-16 16:34:33.365: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:37.115: D/dalvikvm(1702): GC_FOR_ALLOC freed 392K, 4% free 13787K/14296K, paused 164ms, total 167ms
11-16 16:34:38.345: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:45.285: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
11-16 16:34:49.475: I/Choreographer(1702): Skipped 67 frames!  The application may be doing too much work on its main thread.

如果我让应用程序在我的 AVD 上运行，LogCat 只会继续循环日志的这一部分:

11-16 16:34:31.046: W/EGL_emulation(1702): eglSurfaceAttrib not implemented
    11-16 16:34:31.595: I/Choreographer(1702): Skipped 32 frames!  The application may be doing too much work on its main thread.

我不知道如何解决这个问题。请帮忙!

最佳答案

您的 AboutActivity 类...

public class AboutActivity extends MainActivity {

请改成:

public class AboutActivity extends Activity {

正如其他人指出的那样，在构建您的 Intent 时，请使用 this 或 MainActivity.this。

关于java - 从 MainActivity 中的 onCreate() 启动另一个 Activity？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20024254/

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