Android实现图片加载进度提示

public class LoadingImageView extends ImageView {
 /*** 背景图片 */
 private Drawable bgDrawable;
 /**前景图片*/
 private Drawable fgDrawable;
 /**是否显示加载进度条*/
 private boolean isShowProgress;
 
 private Resources rsc;
 private int progress;
 private int progressHeight;
 private int progressLeft;
 private int progressTop;
 private int progressRight;
 private int progressBottom;
 
 
 public LoadingImageView(Context context) {
 this(context,null);
 }
 
 public LoadingImageView(Context context, AttributeSet attrs) {
 this(context, attrs,0);
 }
 
 public LoadingImageView(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 rsc = getResources();
 }
 
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 if(bgDrawable==null){
  return;
 }
 progressLeft = getMeasuredWidth()/2-(fgDrawable.getIntrinsicWidth()/2);
 progressTop = getMeasuredHeight()/2-(fgDrawable.getIntrinsicHeight()/2);
 progressRight = getMeasuredWidth()/2+(fgDrawable.getIntrinsicWidth()/2);
 progressBottom = getMeasuredHeight()/2+(fgDrawable.getIntrinsicHeight()/2);
 }
 
 
 @Override
 public boolean onTouchEvent(MotionEvent event) {
 return super.onTouchEvent(event);
 }
 
 /**
 * 设置背景图片
 * @param drawableRes
 */
 public void setBgDrawableRes(int drawableRes){
 bgDrawable = rsc.getDrawable(drawableRes);
 invalidate();
 }
 
 public void setFgDrawableRes(int drawableRes){
 fgDrawable = rsc.getDrawable(drawableRes);
 invalidate();
 }

 
 public void setProgress(int progress,boolean flag) {
 isShowProgress = flag;
 if(progress =0&progress<=100){
  this.progress = progress;
  invalidate();
 }
 }
 
 
 @Override
 protected void onDraw(Canvas canvas) {
 if(bgDrawable!=null){
  bgDrawable.setBounds(progressLeft, progressTop, progressRight, progressBottom);
  bgDrawable.draw(canvas);
 }
 super.onDraw(canvas);
 if(bgDrawable!=null&&isShowProgress){
  bgDrawable.setBounds(progressLeft, progressTop, progressRight, progressBottom);
  bgDrawable.draw(canvas);
 }
 if(fgDrawable!=null&&isShowProgress){
  //根据进度计算图片显示的高的比
  progressHeight = fgDrawable.getIntrinsicHeight()*progress/100;
  //关键代码，设置图片的显示区域
  canvas.clipRect(progressLeft,progressBottom-progressHeight,progressRight,progressBottom);
  fgDrawable.setBounds(progressLeft, progressTop, progressRight, progressBottom);
  fgDrawable.draw(canvas);
 }
 }
 
 
}

public class LoadingCircleView extends View {
private final Paint paint; 
private final Context context; 
private Resources res;
private int progress;
private int ringWidth;
//圆环的颜色
private int ringColor;
//进度条颜色
private int progressColor;
//字体颜色
private int textColor;
//字的大小
private int textSize;
private String textProgress;
public LoadingCircleView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.context = context; 
this.paint = new Paint(); 
this.res = context.getResources();
this.paint.setAntiAlias(true); //消除锯齿 
this.ringWidth = dip2px(context, 10); //设置圆环宽度 
this.ringColor = Color.rgb(233, 233, 233);
this.progressColor = Color.rgb(146, 206, 108);
this.textColor = Color.rgb(203, 203, 203);
this.textSize = 30;
}
public LoadingCircleView(Context context, AttributeSet attrs) {
this(context, attrs,0);
}
public LoadingCircleView(Context context) {
this(context,null);
}
/**
* 设置加载进度，取值范围在0~100之间
* @param progress
*/
public void setProgress(int progress) {
if(progress =0&&progress<=100){
this.progress = progress;
invalidate();
}
}
/**
* 设置圆环背景色
* @param ringColor
*/
public void setRingColor(int ringColor) {
this.ringColor = res.getColor(ringColor);
}
/**
* 设置进度条颜色
* @param progressColor
*/
public void setProgressColor(int progressColor) {
this.progressColor = res.getColor(progressColor);
}
/**
* 设置字体颜色
* @param textColor
*/
public void setTextColor(int textColor) {
this.textColor = res.getColor(textColor);
}
/**
* 设置字体大小
* @param textSize
*/
public void setTextSize(int textSize) {
this.textSize = textSize;
}
/**
* 设置圆环半径
* @param ringWidth
*/
public void setRingWidthDip(int ringWidth) {
this.ringWidth = dip2px(context, ringWidth);
}
/**
* 通过不断画弧的方式更新界面，实现进度增加
*/
@Override
protected void onDraw(Canvas canvas) {
int center = getWidth()/2; 
int radios = center-ringWidth/2;
//绘制圆环 
this.paint.setStyle(Paint.Style.STROKE); //绘制空心圆  
this.paint.setColor(ringColor);
this.paint.setStrokeWidth(ringWidth); 
canvas.drawCircle(center,center, radios, this.paint); 
RectF oval = new RectF(center-radios, center-radios, center+radios, center+radios);
this.paint.setColor(progressColor);
canvas.drawArc(oval, 90, 360*progress/100, false, paint);
this.paint.setStyle(Paint.Style.FILL);
this.paint.setColor(textColor);
this.paint.setStrokeWidth(0);
this.paint.setTextSize(textSize);
this.paint.setTypeface(Typeface.DEFAULT_BOLD);
textProgress = progress+"%";
float textWidth = paint.measureText(textProgress);
canvas.drawText(textProgress, center-textWidth/2, center+textSize/2, paint);
super.onDraw(canvas); 
}
/** 
* 根据手机的分辨率从 dp 的单位 转成为 px(像素) 
*/ 
public static int dip2px(Context context, float dpValue) { 
final float scale = context.getResources().getDisplayMetrics().density; 
return (int) (dpValue * scale + 0.5f); 
} }

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
<com.example.imagetest.LoadingImageView
android:id="@+id/loading_image_view"
android:layout_width="258px"
android:layout_height="257px"
android:background="#330000"
</com.example.imagetest.LoadingImageView 
<com.example.imagetest.LoadingCircleView
android:id="@+id/loading_cirle_view"
android:layout_width="100dp"
android:layout_height="100dp"
</com.example.imagetest.LoadingCircleView 
<!-- 
<ListView 
android:id="@+id/listview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
</ListView  -- 
</LinearLayout 

public class MainActivity extends Activity {
ListView listview;
private LoadingImageView loadingImageView;
private LoadingCircleView loadingCircleView;
private Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {
loadingImageView.setProgress(msg.what,true);
loadingCircleView.setProgress(msg.what);
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loadingImageView = (LoadingImageView) findViewById(R.id.loading_image_view);
loadingImageView.setFgDrawableRes(R.drawable.bg_click_load_img);
loadingImageView.setBgDrawableRes(R.drawable.ic_launcher);
loadingImageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
loading(); 
}
});
loadingCircleView = (LoadingCircleView) findViewById(R.id.loading_cirle_view);
loadingCircleView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
loading();
}
});
// listview = (ListView) findViewById(R.id.listview);
// showImage();
}
private void loading(){
Thread t = new Thread(){
@Override
public void run() {
int i = 0;
while(i<=100){
try {
i++;
handler.sendEmptyMessage(i);
this.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
super.run();
}
};
t.start();
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onPause() {
super.onPause();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}