android 自定义百分比显示进度条（改进版）

package com.feng; import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.widget.ProgressBar; public class MyProgress extends ProgressBar{ String text; Paint mPaint; public MyProgress(Context context) { super(context); // TODO Auto-generated constructor stub System.out.println("1"); initText(); } public MyProgress(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub System.out.println("2"); initText(); } public MyProgress(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub System.out.println("3"); initText(); } @Override public synchronized void setProgress(int progress) { // TODO Auto-generated method stub setText(progress); super.setProgress(progress); } @Override protected synchronized void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); //this.setText(); Rect rect = new Rect(); this.mPaint.getTextBounds(this.text, 0, this.text.length(), rect); int x = (getWidth() / 2) - rect.centerX(); int y = (getHeight() / 2) - rect.centerY(); canvas.drawText(this.text, x, y, this.mPaint); } //初始化，画笔 private void initText(){ this.mPaint = new Paint(); this.mPaint.setColor(Color.WHITE); //在原作者的基础上增加了以下代码，因为在高分辨率的手机下，进度条里的字体太小 DisplayMetrics dm = getResources().getDisplayMetrics(); int displayWidth = dm.widthPixels; if(displayWidth>480) { this.mPaint.setTextSize(36); } else { this.mPaint.setTextSize(18); } } private void setText(){ setText(this.getProgress()); } //设置文字内容 private void setText(int progress){ int i = (progress * 100)/this.getMax(); this.text = String.valueOf(i) + "%"; } /** * @Description: TODO * @param context * @return * @return float */ public static int getScreenWidth(Activity context) { DisplayMetrics metric = new DisplayMetrics(); context.getWindowManager().getDefaultDisplay().getMetrics(metric); return metric.widthPixels; } /** * @Description: TODO * @param context * @return * @return float */ public static int getScreenHeight(Activity context) { DisplayMetrics metric = new DisplayMetrics(); context.getWindowManager().getDefaultDisplay().getMetrics(metric); return metric.heightPixels; } }