启动一个照相程序并保存照片到制定目录以及屏幕旋转时参数的记录-优快云博客

本文介绍了一个简单的Android应用程序如何实现拍照功能。通过启动相机活动并指定图片输出路径，应用可以捕捉照片并显示在界面上。文章还涉及了屏幕旋转时的状态保存与恢复。

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_path = Environment.getExternalStorageDirectory() + "/images/make_machine_example.jpg";

protected void startCameraActivity()
    {
     File file = new File( _path );
     Uri outputFileUri = Uri.fromFile( file );

     Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE );
     intent.putExtra( MediaStore.EXTRA_OUTPUT, outputFileUri );

     startActivityForResult( intent, 0 );
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
    	Log.i( "MakeMachine", "resultCode: " + resultCode );
    	switch( resultCode )
    	{
    		case 0:
    			Log.i( "MakeMachine", "User cancelled" );
    			break;

    		case -1:
    			onPhotoTaken();
    			break;
    	}
    }

0和1 是指当你按下开始拍照或者取消拍照时的响应代码

    protected void onPhotoTaken()
    {
    	_taken = true;

    	BitmapFactory.Options options = new BitmapFactory.Options();
        options.inSampleSize = 4;

    	Bitmap bitmap = BitmapFactory.decodeFile( _path, options );
    	_image.setImageBitmap(bitmap);

    	    }

    @Override
    protected void onSaveInstanceState( Bundle outState ) {
    	outState.putBoolean( PhotoCaptureExample.PHOTO_TAKEN, _taken );
    }
    @Override
    protected void onRestoreInstanceState( Bundle savedInstanceState){
    	Log.i( "MakeMachine", "onRestoreInstanceState()");
    	if( savedInstanceState.getBoolean( PhotoCaptureExample.PHOTO_TAKEN ) ) {
    		onPhotoTaken();
    	}
    }

前一个是指屏幕旋转前保存后一个指屏幕旋转完成保存