android中怎么自定义手表效果，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

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3.自定义view，显示

package com.example.administrator.testz;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.ImageView;import java.util.Calendar;/** * 优化方案： * 表盘课绘制一次 * 在分线程中进行加载 */public class MainActivity extends AppCompatActivity implements View.OnClickListener { private Button btnStart, btnStop; private ImageView mClockImageView; Bitmap.Config config = Bitmap.Config.ARGB_8888; int width = 500; int height = 500; private Calendar mCalendar; private int mHour, mMinute, mSecond; private float mDegrees; private float length; private boolean mIsRunning; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  btnStart = (Button) findViewById(R.id.btn_start);  btnStop = (Button) findViewById(R.id.btn_stop);  btnStop.setOnClickListener(this);  btnStart.setOnClickListener(this);  mClockImageView = (ImageView) findViewById(R.id.iv_clock);  mClockImageView.setImageBitmap(drawClock()); } /**  * 画表盘  */ private Bitmap drawClockFace() {  Bitmap bm = Bitmap.createBitmap(width, height, config);  Canvas canvas = new Canvas(bm);  Paint paint = new Paint();  paint.setAntiAlias(true); //锯齿  paint.setStyle(Paint.Style.STROKE); // 空心  paint.setStrokeWidth(5);  paint.setColor(Color.parseColor("#333333"));  // 外层圆  canvas.drawCircle(width / 2, height / 2, width / 2, paint);  // 內层圆 --》圆心  paint.setStyle(Paint.Style.FILL);  canvas.drawCircle(width / 2, height / 2, 10, paint);  // 循环画刻度(旋转画刻度)  for (int i = 0; i < 12; i++) {   if (i % 3 == 0) {    paint.setStrokeWidth(10);    canvas.drawLine(width / 2, 0, width / 2, 24, paint);    canvas.rotate(30, width / 2, height / 2);   } else {    canvas.drawLine(width / 2, 0, width / 2, 10, paint);    canvas.rotate(30, width / 2, height / 2);   }  }  return bm; } private Bitmap drawClock() {  Bitmap bm = drawClockFace();  Canvas canvas = new Canvas(bm);  Paint paint = new Paint();  paint.setAntiAlias(true);  paint.setColor(Color.parseColor("#333333"));  mCalendar = Calendar.getInstance();  mHour = mCalendar.get(Calendar.HOUR);  mMinute = mCalendar.get(Calendar.MINUTE);  mSecond = mCalendar.get(Calendar.SECOND);  //画小时指针  paint.setStrokeWidth(10);  mDegrees = mHour * 30 + mMinute / 2;  length = (width / 2) * 0.7f;  canvas.save();  canvas.rotate(mDegrees, width / 2, height / 2);  canvas.drawLine(width / 2, height / 2, width / 2, height - (height / 2) - length, paint);  canvas.restore();//  canvas.rotate(360 - mDegrees, width / 2, height / 2);  //画分钟指针  paint.setStrokeWidth(4);  mDegrees = mMinute * 6 + mSecond / 10;  length = (width / 2) * 0.78f;  canvas.save();  canvas.rotate(mDegrees, width / 2, height / 2);  canvas.drawLine(width / 2, height / 2, width / 2, height - (height / 2) - length, paint);  canvas.restore();//  canvas.rotate(360 - mDegrees, width / 2, height / 2);  //画分钟指针  paint.setStrokeWidth(2);  mDegrees = mSecond * 6;  length = (width / 2) * 0.92f;  canvas.save();  canvas.rotate(mDegrees, width / 2, height / 2);  canvas.drawLine(width / 2, height / 2, width / 2, height - (height / 2) - length, paint);  canvas.restore();  return bm; } @Override public void onClick(View v) {  switch (v.getId()) {   case R.id.btn_start:    mIsRunning = true;    new ClockTask().execute("");    break;   case R.id.btn_stop:    mIsRunning = false;    break;  } } @Override protected void onDestroy() {  super.onDestroy();  mIsRunning = false; } private class ClockTask extends AsyncTask {  @Override  protected Object doInBackground(Object... objects) {   while (mIsRunning) {    publishProgress("");    try {     Thread.sleep(1000);    } catch (InterruptedException e) {     e.printStackTrace();    }   }   return null;  }  @Override  protected void onProgressUpdate(Object... values) {   super.onProgressUpdate(values);   mClockImageView.setImageBitmap(drawClock());  } }}

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