我有以下代码来旋转图像,但是当我拖动搜索栏时,它会在旧图像上创建一个新的位图(它应该旋转旧图像而不是创建新图像),有人可以帮我整理这个东西吗。? 我访问了我的旧问题,但没有人为我解决这个问题
公共类MainActivity扩展了Activity实现OnSeekBarChangeListener {
ImageView iv_image;
SeekBar seekbar;
Bitmap source;
float angle = 0;
Button buttonClick;
Bitmap rotatedImage;
static Matrix matrix;
Matrix m1 ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
buttonClick = (Button) findViewById(R.id.bt);
buttonClick.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
angle += 90;
iv_image.buildDrawingCache();
source = iv_image.getDrawingCache();
rotatedImage = rotateImage(source, angle);
iv_image.setImageBitmap(rotatedImage);
}
});
}
void init() {
iv_image = (ImageView) findViewById(R.id.iv_image);
seekbar = (SeekBar) findViewById(R.id.seekbar);
seekbar.setOnSeekBarChangeListener(this);
// seekbar.setOnSeekBarChangeListener((OnSeekBarChangeListener) this);
}
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
angle = progress;
iv_image.buildDrawingCache();
source = iv_image.getDrawingCache();
rotatedImage = rotateImage(source, angle);
iv_image.setImageMatrix(null);
iv_image.setImageBitmap(rotatedImage);
}
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
public static Bitmap rotateImage(Bitmap sourceImage, float angle) {
matrix = new Matrix();
matrix.postRotate(angle);
return Bitmap.createBitmap(sourceImage, 0, 0, sourceImage.getWidth(),
sourceImage.getHeight(), matrix, true);
}
答案 0 :(得分:2)
请改为尝试:
public static void rotateImage(float angle) {
matrix = new Matrix();
matrix.postRotate(angle);
imageView.setImageMatrix(matrix);
imageView.invalidate();
}
这是你的界面实现:
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
angle = progress;
rotateImage(angle);
}
这样你就可以在ImageView中旋转Bitmap,效率更高。
您甚至可以通过使其成为私有成员并在轮换后调用 imageView.invalidate()来重用Matrix对象,以优化您的代码。
答案 1 :(得分:0)
public static void rotateImage(float angle) {
matrix = new Matrix();
matrix.postRotate(angle);
imageView.setScaleType(ImageView.ScaleType.MATRIX);
imageView.setImageMatrix(matrix);
imageView.invalidate();
}