android實現(xiàn)App活動定時自動跳轉(zhuǎn)效果

2019-10-23 19:46:47

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App的小功能點，很簡單幾十行代碼就可以實現(xiàn)

主頁面代碼

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 + "秒后進入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() {    //全屏顯示    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();  }  //進入APP倒計時  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，通過一個計時線程來控制主線程（即UI線程）來更新UI

通過Handler來接受來自計時線程的Message

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

2.計時線程（內(nèi)部類），設(shè)置每隔1秒睡一次，共3秒

//進入APP倒計時  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.最后別忘了在init（）方法中啟動線程

private void init() {    //全屏顯示    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，現(xiàn)在基本都完成了，來看效果

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