android卡通片-拖动

先上图看效果

实质上说是动画有点不妥，确切的说应该是手势的处理，废话不多说看代码

SimpleDragSample.java

public class SimpleDragSample extends Activity {	protected int contentTop;	@Override	protected void onCreate(Bundle savedInstanceState) {		// TODO Auto-generated method stub		super.onCreate(savedInstanceState);		setContentView(R.layout.layout_simpledrag)  ;		DisplayMetrics dm = getResources().getDisplayMetrics()  ;		final int screenWidth = dm.widthPixels  ;		final int screenHeight = dm.heightPixels  ;						Log.e("width,height", screenWidth + "," + screenHeight);				final Button _Button = (Button)findViewById(R.id.buttonDrag)  ;		_Button.setOnTouchListener(new OnTouchListener() {			int lastX , lastY  ;			boolean isDraging  = false  ;						@Override			public boolean onTouch(View v, MotionEvent event) {				int ea = event.getAction()  ;				switch (ea) {				case MotionEvent.ACTION_DOWN:					isDraging = true ;					lastX = (int) event.getRawX()  ;					lastY = (int) event.getRawY()  ;					if(contentTop == 0) {						contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();//获取状态栏和标题栏的总高度					}					break;				case MotionEvent.ACTION_MOVE:					if(isDraging)					{						int dx = (int)event.getRawX() - lastX  ;						int dy = (int)event.getRawY() - lastY  ;												int l = v.getLeft() + dx  ;						int b = v.getBottom() + dy  ;						int r = v.getRight() + dx  ;						int t = v.getTop() + dy  ;												//判断超出屏幕						if(l<0)						{							l = 0 ;							r = v.getWidth()  ;						}						if(t<0)						{							t = 0 ;							b = v.getHeight()  ;						}						if(r>screenWidth)						{							r = screenWidth  ;							l = r - v.getWidth()  ;						}						if(b>screenHeight - contentTop)						{							b = screenHeight - contentTop ;							t = b - v.getHeight()  ;						}												v.layout(l, t, r, b)  ;						lastX = (int) event.getRawX()  ;						lastY = (int) event.getRawY()  ;						v.postInvalidate()  ;					}										break ;				case MotionEvent.ACTION_UP:					isDraging = false  ;					break ;				default:					break;				}				return false;			}		}) ;	}}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        android:id="@+id/buttonDrag"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button"         >    </Button></RelativeLayout>

1.view.getLeft、view.getRight、view.getTop、view.getBottom都是相对父view的位置，这里button的父view为我们定义的RelativeLayout,是不包括顶部状态栏和标题栏的。

这篇文章讲解的很详细

http://blog.csdn.net/androiddevelop/article/details/8373782

2.用以下代码测试我的小米手机（480*854），获取的值为320*569

DisplayMetrics dm = getResources().getDisplayMetrics()  ;final int screenWidth = dm.widthPixels  ;final int screenHeight = dm.heightPixels  ;

解决办法：

注： density 不等于1的情况下，需要设置targetSdkVersion在4-9之间，例如

<uses-sdk android:minSdkVersion="3" android:targetSdkVersion="10" />

<supports-screens            android:smallScreens="true"            android:normalScreens="true"            android:largeScreens="true"            android:xlargeScreens="true"            android:resizeable="true"            android:anyDensity="true" />

3.三种方式获取屏幕分辨率

（1）直接 int screenWidth = getWindowManager().getDefaultDisplay().getWidth();	int screenHeight = getWindowManager().getDefaultDisplay().getHeight();	（2）通过getResources()获取DisplayMetrics对象，DisplayMetrics dm = new DisplayMetrics();dm = getResources().getDisplayMetrics();screenWidth = dm.widthPixels;	screenHeight = dm.heightPixels;	（3）通过getWindowManager()获取dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);screenWidth = dm.widthPixels;	screenHeight = dm.heightPixels;