android实现App活动定时自动跳转效果

2019-12-12 03:42:45

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来源：转载

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App的小功能点，很简单几十行代码就可以实现

主页面代码

package com.buildingbuilding;import android.content.Intent;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.WindowManager;import android.widget.TextView;import com.buildingbuilding.activitys.BuildingActivity;public class MainActivity extends AppCompatActivity {  private TextView textView;  private Handler handler = new Handler() {    @Override    public void handleMessage(Message msg) {      if (msg.what != 0) {        textView.setText(msg.what + "秒后进入APP");      } else {        Intent intent = new Intent(MainActivity.this, BuildingActivity.class);        startActivity(intent);        finish();      }    }  };  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    init();  }  private void init() {    //全屏显示    getSupportActionBar().hide();    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);    textView = (TextView) findViewById(R.id.textView);    textView.setText("布丁布丁");    new CountDown().start();  }  //进入APP倒计时  class CountDown extends Thread {    int count = 3;    @Override    public void run() {      try {        while (count >= 0) {          sleep(1000);          Message message = new Message();          message.what = count;          handler.sendMessage(message);          count--;        }      } catch (InterruptedException e) {        e.printStackTrace();      }    }  }}

基本思路就是，通过一个计时线程来控制主线程（即UI线程）来更新UI

通过Handler来接受来自计时线程的Message

private Handler handler = new Handler() {    @Override    public void handleMessage(Message msg) {      if (msg.what != 0) {        textView.setText(msg.what + "秒后进入APP");      } else {        Intent intent = new Intent(MainActivity.this, BuildingActivity.class);        startActivity(intent);        finish();      }    }  };

2.计时线程（内部类），设置每隔1秒睡一次，共3秒

//进入APP倒计时  class CountDown extends Thread {    int count = 3;    @Override    public void run() {      try {        while (count >= 0) {          sleep(1000);          Message message = new Message();          message.what = count;          handler.sendMessage(message);          count--;        }      } catch (InterruptedException e) {        e.printStackTrace();      }    }  }

3.最后别忘了在init（）方法中启动线程

private void init() {    //全屏显示    getSupportActionBar().hide();    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);    textView = (TextView) findViewById(R.id.textView);    textView.setText("布丁布丁");    new CountDown().start();  }

OK，现在基本都完成了，来看效果

这里写图片描述