アプリのカメラ セクションを約 1 週間動作させようとしてきましたが、最終的にバグを修正した後、新しいバグが作成されました。
アクティビティを再開すると、プレビューが機能せず、記録機能も機能しません。Logcat を見ると、Camera
オブジェクトが null に等しいことがわかり、それを再作成するための away が見つかりません。
私の作成時
mCamera = getCameraInstance();
// Create preview view and set it as the content of our activity.
mPreview = new CameraPreview(this, mCamera);
preview = (FrameLayout) findViewById(R.id.previewer);
preview.addView(mPreview);
Get Camera インスタンス メソッド
private Camera getCameraInstance() {
Camera c = null;
try {
//c = Camera.open(); // attempt to get a Camera instance
c = this.open(); // attempt to get a Camera instance
} catch (Exception e) {
// Camera is not available (in use or does not exist)
}
Log.i("TEST getCameraInstance", "" + c);
return c; // returns null if camera is unavailable
}
マイ・オン・ポーズ
protected void onPause() {
super.onPause();
try {
// release the camera immediately on pause event
// releaseCamera();
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mCamera.release();
mCamera = null;
} catch (Exception e) {
e.printStackTrace();
}
}
私の履歴書
protected void onResume() {
super.onResume();
try {
mCamera = Camera.open();
mCamera = getCameraInstance();
Log.i("TEST onresume", "onResume Runing");
Log.i("TEST onresume", "camera " + mCamera);
mCamera.setPreviewCallback(null);
Log.i("TEST onresume", "camera " + mCamera);
//mCamera = getCameraInstance();
Log.i("TEST onresume", "camera " + mCamera);
// mCamera.setPreviewCallback(null);
mPreview = new CameraPreview(MainRecordScreen.this, mCamera);// set preview
Log.i("TEST onresume", "camera " + mCamera);
preview.addView(mPreview);
Log.i("TEST onresume", "camera " + mCamera);
mCamera.startPreview();
} catch (Exception e) {
Log.d(TAG, "Error starting camera preview: " + e.getMessage());
}
Log.i("TEST onresume", "camera " + mCamera);
}
マイ LogCat
06-19 06:38:40.223: E/AndroidRuntime(16702): FATAL EXCEPTION: main
06-19 06:38:40.223: E/AndroidRuntime(16702): java.lang.NullPointerException
06-19 06:38:40.223: E/AndroidRuntime(16702): at com.plcd.test.MainRecordScreen.prepareVideoRecorder(MainRecordScreen.java:198)
06-19 06:38:40.223: E/AndroidRuntime(16702): at com.plcd.test.MainRecordScreen.access$7(MainRecordScreen.java:193)
06-19 06:38:40.223: E/AndroidRuntime(16702): at com.plcd.test.MainRecordScreen$3.onClick(MainRecordScreen.java:115)
06-19 06:38:40.223: E/AndroidRuntime(16702): at android.view.View.performClick(View.java:3511)
06-19 06:38:40.223: E/AndroidRuntime(16702): at android.view.View$PerformClick.run(View.java:14105)
06-19 06:38:40.223: E/AndroidRuntime(16702): at android.os.Handler.handleCallback(Handler.java:605)
06-19 06:38:40.223: E/AndroidRuntime(16702): at android.os.Handler.dispatchMessage(Handler.java:92)
06-19 06:38:40.223: E/AndroidRuntime(16702): at android.os.Looper.loop(Looper.java:137)
06-19 06:38:40.223: E/AndroidRuntime(16702): at android.app.ActivityThread.main(ActivityThread.java:4424)
06-19 06:38:40.223: E/AndroidRuntime(16702): at java.lang.reflect.Method.invokeNative(Native Method)
06-19 06:38:40.223: E/AndroidRuntime(16702): at java.lang.reflect.Method.invoke(Method.java:511)
06-19 06:38:40.223: E/AndroidRuntime(16702): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-19 06:38:40.223: E/AndroidRuntime(16702): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-19 06:38:40.223: E/AndroidRuntime(16702): at dalvik.system.NativeStart.main(Native Method)
mCamera
getCameraInstance()
役立つ場合は、メソッドから null を返します。