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public String getPath(Uri uri) {
		String siPath;
		// 1:MEDIA GALLERY --- query from MediaStore.Images.Media.DATA
		String[] projection = { MediaStore.Images.Media.DATA };
		Cursor cursor = managedQuery(uri, projection, null, null, null);
		if (cursor != null) {
			int column_index = cursor
					.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
			cursor.moveToFirst();
			siPath = cursor.getString(column_index);

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public class ResizableImageView extends ImageView {

    public ResizableImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
         Drawable d = getDrawable();

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 android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:adjustViewBounds="true"
  android:scaleType="fitCenter"

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  Rect rect = new Rect();
                int childCount = mListView.getChildCount();
                int[] listViewCoords = new int[2];
                mListView.getLocationOnScreen(listViewCoords);
                System.err.println("listViewCoords[0]====>"+listViewCoords[0]);
                System.err.println("listViewCoords[1]====>"+listViewCoords[1]);
                int x = (int) motionEvent.getRawX() - listViewCoords[0];
                int y = (int) motionEvent.getRawY() - listViewCoords[1];
                View child;
                for (int i = 0; i < childCount; i++) {

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public class RotateZoomImageView extends ImageView {
	private ScaleGestureDetector mScaleDetector;
	private Matrix mImageMatrix;
	/* Last Rotation Angle */
	private int mLastAngle = 0;
	/* Pivot Point for Transforms */
	private int mPivotX, mPivotY;
	private float mStartX, mStartY;

	public RotateZoomImageView(Context context) {

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matrix代表一个3*3矩阵，其内容如下
MSCALE_X  MSKEW_X   MTRANS_X

MSKEW_Y   MSKEW_Y   MTRANS_Y

MPERSP_0  MPERSP_1  MPERSP_2

    Matrix matrix=new Matrix();
		System.err.println(matrix.toShortString());
		matrix.postScale(2, 3);

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OverScroller
  startScroll() 开始滚动
  computeScrollOffset() 方法不断计算滚动到的最新的位置，当滚动动画结束时，方法返回false。所以通常使用以下方式不断根据最新的位置绘制view来达到滚动的效果
  if (mScroller.computeScrollOffset()) {
            // This is called at drawing time by ViewGroup.  We use
            // this method to keep the fling animation going through
            // to completion.
            int oldX = getScrollX();
            int oldY = getScrollY();
            int x = mScroller.getCurrX();

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public class CircularProgressButton extends Button{
	public static final int IDLE_STATE_PROGRESS = 0;
    public static final int ERROR_STATE_PROGRESS = -1;

    private GradientDrawable background;

    private State mState;
    private String mIdleText;
    private String mCompleteText;
    private String mErrorText;

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package net.yscs.android.square_progressbar_example.dialogs;

import net.yscs.android.square_progressbar_example.R;
import android.app.Dialog;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.view.View;
import android.view.Window;
import android.widget.Button;

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	/**
	 * 
	 * thread-safe
	 * 
	 */
	public class Singleton {
		private static final Singleton INSTANCE = new Singleton();

		private Singleton() {
		}