Android开发中自定义ProgressBar控件的方法示例

本文实例讲述了Android开发中自定义ProgressBar控件的方法。分享给大家供大家参考，具体如下：

很简单，首先加载Drawable，在onMeasure设置好其区域大小，

然后使用canvas.clipRect绘图

public class ProgressView extends ImageView {
  private Drawable maskDraw;
  
  private int mProcess = 20;
  public ProgressView(Context context, AttributeSet attrs) {
    super(context, attrs);
    maskDraw = context.getResources().getDrawable(R.drawable.red_bg);
  }
  @Override
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    // 保存当前画笔的状态
    canvas.save();
    int topline = (int) (getHeight() - getHeight() * getProcess() / 100);
    
    canvas.clipRect(0, topline, getWidth(), getHeight());
    maskDraw.draw(canvas);
    // 恢复到之前保存的状态
    canvas.restore();
  }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    maskDraw.setBounds(0, 0, getWidth(), getHeight());
  }
  public float getProcess() {
    return mProcess;
  }
  
  public void setProgress(int mProcess) {
    if (mProcess > 100) {
      this.mProcess = 100;
    }
    if (mProcess < 0) {
      this.mProcess = 0;
    }
    this.mProcess = mProcess;
    invalidate();
  }
}

使用方法

public class ProgressActivity extends Activity {
  private ProgressView piv;
  private int pivDeep = 0;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_progressview);
    piv = (ProgressView) findViewById(R.id.my_pro_iv);
    handler.sendEmptyMessage(2);
  }
  private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
      switch (msg.what) {
      case 1:
 piv.setProgress(pivDeep);
 break;
      case 2:
 new Thread() {
   public void run() {
     while (true) {
pivDeep = (pivDeep + 5) % 100;
handler.sendEmptyMessage(1);
try {
  Thread.sleep(200);
} catch (InterruptedException e) {
  e.printStackTrace();
}
     }
   };
 }.start();
 break;
      default:
 break;
      }
    }
  };
}

更多关于Android相关内容感兴趣的读者可查看本站专题：《Android窗口相关操作技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》

希望本文所述对大家Android程序设计有所帮助。