android多点触控缩放图片及单点触控图片移动

  次阅读 来源:互联网(转载协议) 2015-09-29 10:34 我要评论(0)

转载请注明原文出处:奔跑的蜗牛(袁方的技术博客)点击打开链接

原始图片:

点击放大按钮,或两手拖拉屏幕。

上代码:

public class main extends Activity { /** Called when the activity is first created. */ private ImageZoomView mZoomView; private ZoomState mZoomState; private Bitmap mBitmap; private SimpleZoomListener mZoomListener; private ProgressBar progressBar; private Handler handler = new Handler() { @Override public void handleMessage(Message msg) { progressBar.setVisibility(View.GONE); mZoomView.setImage(mBitmap); mZoomState = new ZoomState(); mZoomView.setZoomState(mZoomState); mZoomListener = new SimpleZoomListener(); mZoomListener.setZoomState(mZoomState); mZoomView.setOnTouchListener(mZoomListener); resetZoomState(); } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // 隐藏顶部程序名称 写在setContentView(R.layout.xxxx);之前,不然报错 requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); requestWindowFeature(Window.FEATURE_NO_TITLE); // 隐藏状态栏 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_image); mZoomView = (ImageZoomView) findViewById(R.id.zoomView); progressBar = (ProgressBar) findViewById(R.id.progress_large); progressBar.setVisibility(View.VISIBLE); Thread thread = new Thread(new Runnable() { @Override public void run() { /* * 加载网络图片 load form url */ // mBitmap = // ImageDownloader.getInstance().getBitmap(url); mBitmap = BitmapFactory.decodeResource( main.this.getResources(), R.drawable.test); handler.sendEmptyMessage(0); } }); thread.start(); ZoomControls zoomCtrl = (ZoomControls) findViewById(R.id.zoomCtrl); zoomCtrl.setOnZoomInClickListener(new OnClickListener() { @Override public void onClick(View v) { float z = mZoomState.getZoom() + 0.25f; mZoomState.setZoom(z); mZoomState.notifyObservers(); } }); zoomCtrl.setOnZoomOutClickListener(new OnClickListener() { @Override public void onClick(View v) { float z = mZoomState.getZoom() - 0.25f; mZoomState.setZoom(z); mZoomState.notifyObservers(); } }); } @Override protected void onDestroy() { super.onDestroy(); if (mBitmap != null) mBitmap.recycle(); } private void resetZoomState() { mZoomState.setPanX(0.5f); mZoomState.setPanY(0.5f); mZoomState.setZoom(1f); mZoomState.notifyObservers(); } }

public class ImageZoomView extends View implements Observer

{

private final Paint mPaint =new Paint(Paint.FILTER_BITMAP_FLAG);

private final Rect mRectSrc = new Rect();

private final Rect mRectDst = new Rect();

private float mAspectQuotient;

private Bitmap mBitmap;

private ZoomState mState;

public ImageZoomView(Context context, AttributeSet attrs)

{

super(context, attrs);

}

public void setZoomState(ZoomState state)

{

if (mState != null)

{

mState.deleteObserver(this);

}

mState = state;

mState.addObserver(this);

invalidate();

}

protected void onDraw(Canvas canvas)

{

if (mBitmap != null && mState != null)

{

final int viewWidth = getWidth();

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