我在使用 ICS 上的 ACTION_IMAGE_CAPTURE Intent 调用我的 Droid Razr M 上的内置相机应用程序时遇到问题,我希望其他人已经看到了这一点并知道如何解决/解决这个问题。我的应用程序启动相机,等待用户捕获并接受图像,然后在返回时对其进行处理。但请注意,下面的示例应用程序中没有处理图像,问题仍然存在。这里的关键元素是我们在从 Intent 返回时立即重新调用相机,以允许用户继续拍照,一张一张。这在许多设备(十几种不同的设备)上运行良好,但在运行 4.1.2(以及早期版本的 ICS)的 Droid Razr M 上失败。拍摄第二张照片后出现故障——相机上的所有按钮都被禁用,只有后退按钮起作用。如果我们在重新启动 Intent 之前在我们的应用程序中设置 5 秒或更长时间的延迟,问题就不会发生——但这是不可接受的。这是一个演示问题的简单重现应用程序(请注意,您需要启用 WRITE_EXTERNAL_STORAGE 权限才能使其工作):
public class MainActivity extends Activity {
private static final int RESPONSE_SINGLE_SHOT = 45;
private static final String TAG = "CameraTest";
private String mCameraFilePath = null;
@Override
protected void onCreate( Bundle savedInstanceState ) {
super.onCreate( savedInstanceState );
setContentView( R.layout.activity_main );
onLaunchCamera( true ); //The launch is here only for simplification - it also fails in onStart()
}
@Override
protected void onActivityResult( final int requestCode, final int resultCode, final Intent intent )
{
super.onActivityResult(requestCode, resultCode, intent);
processImage( requestCode, resultCode, intent );
}
public void onLaunchCamera( boolean fromUserAction )
{
final String storageState = Environment.getExternalStorageState();
if (storageState.equals(Environment.MEDIA_MOUNTED))
{
final Intent cameraIntent = new Intent( MediaStore.ACTION_IMAGE_CAPTURE );
cameraIntent.setFlags( Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET );
final List<ResolveInfo> list = getPackageManager().queryIntentActivities( cameraIntent, 0 );
//Grab the first camera in the list, this should be the camera app that came with the device:
final String packageName = list.get(0).activityInfo.packageName;
final String name = list.get(0).activityInfo.name;
final File publicDir = Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_DCIM );
final Time t = new Time();
t.setToNow();
File cameraFile = new File( publicDir, "/Camera/" + makePhotoFileName( t ) );
mCameraFilePath = cameraFile.getAbsolutePath();
Log.i( TAG, "creating camera file: " + mCameraFilePath );
try
{
if ( cameraFile.exists() == false )
{
cameraFile.getParentFile().mkdirs();
if ( cameraFile.createNewFile() )
{
cameraIntent.putExtra( MediaStore.EXTRA_OUTPUT, Uri.fromFile( cameraFile ) );
} else {
Log.e( TAG, "failed to create file:" + cameraFile.getAbsolutePath() );
return;
}
}
} catch ( IOException e )
{
Log.e( TAG, "Could not create file.", e );
return;
}
cameraIntent.setComponent( new ComponentName( packageName, name ) );
startActivityForResult( cameraIntent, RESPONSE_SINGLE_SHOT );
} else {
Log.e(TAG, "SD card not present");
}
}
private void processImage( final int requestCode, final int resultCode, final Intent intent ) {
switch (requestCode)
{
case RESPONSE_SINGLE_SHOT:
if ( resultCode == RESULT_OK )
{
runOnUiThread( new Runnable() {
@Override
public void run() {
onLaunchCamera( false ); //Immediately re-run camera
}
});
}
else {
// delete the placeholder file we created
if ( mCameraFilePath != null ) {
final File cameraFile = new File( mCameraFilePath );
cameraFile.delete();
mCameraFilePath = null;
}
}
break;
default:
break;
}
}
private String makePhotoFileName( final Time t ) {
final String fileName = t.format("IMG_%Y%m%d_%H%M%S") + ".jpg";
return fileName;
}
}
任何帮助是极大的赞赏。