使用TransitionDrawable实现多张图片淡入淡出效果

//讲需要切换的两张图片直接给TransitionDrawable对象TransitionDrawable transitionDrawable = new TransitionDrawable(new Drawable[]{getResources().getDrawable(R.drawable.advertiseone),getResources().getDrawable(R.drawable.advertisetwo)});//一样用imgAdvertise.setImageDrawable(transitionDrawable);//切换图片的时间间隔transitionDrawable.startTransition(3000);

package com.coofond.carservice;import android.content.Intent;import android.graphics.drawable.Drawable;import android.graphics.drawable.TransitionDrawable;import android.os.Build;import android.os.Bundle;import android.os.CountDownTimer;import android.os.Handler;import android.os.Message;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.ImageView;import android.widget.TextView;import com.coofond.carservice.mine.ui.LoginAct;/** * Created by IBM on 2016/10/7. */public class WelcomeAct extends AppCompatActivity {  private TextView tvTimecount;  private ImageView imgAdvertise;  private int adTime = 6000;//倒计时秒数  private int timeInterval = 1000;//倒计时间隔  private CountDownTimer mTimer;//计时器  private int change = 0;//记录下标  private int[] ids = new int[]{R.drawable.advertiseone, R.drawable.advertisetwo, R.drawable.advertisethree};  private Drawable[] drawables;//图片集合  private Thread mThread;//线程  private boolean mThreadFlag = true;//线程结束标志符  @Override  protected void onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.act_welcome);    initView();    initData();    initEvent();  }  //定义hander  private Handler mHandler = new Handler(new Handler.Callback() {    @Override    public boolean handleMessage(Message msg) {      int duration = msg.arg1;      TransitionDrawable transitionDrawable = new TransitionDrawable(new Drawable[]{drawables[change % ids.length],          drawables[(change + 1) % ids.length]});      change++;//改变标识位置      imgAdvertise.setImageDrawable(transitionDrawable);      transitionDrawable.startTransition(duration);      return false;    }  });  //开启线程发送消息，让transition一直在改变  private class MyRunnable implements Runnable {    @Override    public void run() {      //这个while(true)是做死循环      while (mThreadFlag) {        int duration = 1000;//改变的间隔        Message message = mHandler.obtainMessage();        message.arg1 = duration;        mHandler.sendMessage(message);        try {          Thread.sleep(duration);          //隔duration秒发送一次        } catch (InterruptedException e) {          e.printStackTrace();        }      }    }  }  private void initView() {    tvTimecount = (TextView) findViewById(R.id.tv_advert);    imgAdvertise = (ImageView) findViewById(R.id.iv_advetise);    //填充图片    drawables=new Drawable[ids.length];    for (int i = 0; i < ids.length; i++) {      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {        drawables[i] = getDrawable(ids[i]);      } else {        drawables[i] = getResources().getDrawable(ids[i]);      }    }  }  private void initData() {    // 初始化计时器,第一个参数是共要倒计时的秒数，第二个参数是倒计时的间隔    mTimer = new CountDownTimer(adTime, timeInterval) {      // 倒计时开始时要做的事情，参数m是直到完成的时间      @Override      public void onTick(long millisUntilFinished) {        tvTimecount.setText("" + millisUntilFinished / 1000 + "s跳过广告");      }      // 结束计时后要做的工作      @Override      public void onFinish() {        jumpActivity();      }    };    //开启计时器    mTimer.start();    //开启线程，改变transition,切换图片    mThread= new Thread(new MyRunnable());    mThread.start();  }  private void initEvent() {    tvTimecount.setOnClickListener(new View.OnClickListener() {      @Override      public void onClick(View v) {        mTimer.cancel();        jumpActivity();      }    });  }  // 跳转页面  private void jumpActivity() {    //如果还没结束当前的页面，就结束    if (!isFinishing()) {      finish();    }    Intent it = new Intent(WelcomeAct.this, LoginAct.class);    startActivity(it);  }  @Override  protected void onDestroy() {    super.onDestroy();    //mThread.stop(); 不推荐使用    mThreadFlag=false;//结束线程  }}