android自定义ImageView仿图片上传示例

public class ProcessImageView extends ImageView{ 
  private Context context; 
  private Paint paint; 
  private LogUtil log=LogUtil.getInstance(); 
  int progress = 0; 
  private boolean flag; 
 
  public ProcessImageView(Context context) { 
    super(context); 
  } 
 
  public ProcessImageView(Context context, AttributeSet attrs) { 
    this(context, attrs,0); 
  } 
 
  public ProcessImageView(Context context, AttributeSet attrs, int defStyleAttr) { 
    super(context, attrs, defStyleAttr); 
    this.context=context; 
    paint=new Paint(); 
  } 
 
  @Override 
  protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas); 
    paint.setAntiAlias(true); //消除锯齿 
    paint.setStyle(Paint.Style.FILL); //设置paint为实心， Paint.Style.STROKE为空心 
    paint.setColor(Color.parseColor("#70000000")); //设置为半透明 
    canvas.drawRect(0,0,getWidth(),getHeight()-getHeight()*progress/100,paint); //这里getWidth() 获取的是image对象宽高度 xml值*2 
 
    paint.setColor(Color.parseColor("#00000000"));// 全透明 
    canvas.drawRect(0, getHeight() - getHeight() * progress / 100, 
        getWidth(), getHeight(), paint); 
 
    if(!flag){ 
      paint.setTextSize(30); 
      paint.setColor(Color.parseColor("#FFFFFF")); 
      paint.setStrokeWidth(2); 
      Rect rect = new Rect(); 
      paint.getTextBounds("100%", 0, "100%".length(), rect);// 确定文字的宽度 
      canvas.drawText(progress + "%", getWidth() / 2 - rect.width() / 2, 
          getHeight() / 2, paint); 
    } 
  } 
 
  public void setProgress(int progress) { 
    this.progress = progress; 
    if(progress==100){ 
      flag=true; 
    } 
    postInvalidate(); 
  } 
} 

public class MainActivity extends AppCompatActivity { 
  ProcessImageView processImageView =null; 
  int progress=0; 
 
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
 
    processImageView=(ProcessImageView) findViewById(R.id.image); 
    //模拟图片上传进度 
    new Thread(new Runnable() { 
      @Override 
      public void run() { 
        while (true){ 
          if(progress==100){//图片上传完成 
            return; 
          } 
          progress++; 
          processImageView.setProgress(progress); 
          try{ 
            Thread.sleep(200); //暂停0.2秒 
          } catch (InterruptedException e){ 
            e.printStackTrace(); 
          } 
        } 
      } 
    }).start(); 
  } 
} 

paint.setAntiAlias(true); //消除锯齿 
    paint.setStyle(Paint.Style.FILL); //设置paint为实心， Paint.Style.STROKE为空心 
    paint.setColor(Color.parseColor("#70000000")); //设置为半透明 
    canvas.drawRect(0,0,getWidth(),getHeight()-getHeight()*progress/100,paint);  

paint.setColor(Color.parseColor("#00000000"));// 全透明 
    canvas.drawRect(0, getHeight() - getHeight() * progress / 100, 
        getWidth(), getHeight(), paint); 

if(!flag){ 
      paint.setTextSize(30); 
      paint.setColor(Color.parseColor("#FFFFFF")); 
      paint.setStrokeWidth(2); 
      Rect rect = new Rect(); 
      paint.getTextBounds("100%", 0, "100%".length(), rect);// 确定文字的宽度 
      canvas.drawText(progress + "%", getWidth() / 2 - rect.width() / 2, 
          getHeight() / 2, paint); 
    }