Android中延时执行的几种方法
文章目录
- 1、Handler.postDelay
- 2、Handler.sendEmptyMessage
- 3、Thread.sleep
- 4、Timer
- 5、AlarmManager
- 全部代码
1、Handler.postDelay
最简单快捷
/**
* 建议使用优先级：1
*/
private void useHandler1(){
handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
showUI();
}
},6000);
}
2、Handler.sendEmptyMessage
稍微简单快捷
/**
* 建议使用优先级：2
*/
private void userHandler2(){
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what){
case 1000:
showUI();
break;
default:
break;
}
}
};
handler.sendEmptyMessageDelayed(1000,9000);
}
3、Thread.sleep
性能不好，以上三种底层执行代码基本一致
/**
* 建议使用优先级：4
*/
private void useThread(){
Thread thread = new Thread(){
@Override
public void run() {
super.run();
try {
Thread.sleep(12000);
runOnUiThread(new Runnable() {
@Override
public void run() {
showUI();
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
thread.start();
}
4、Timer
简小的定时任务
/**
* 建议使用优先级：3
* 简单应用场合，但不适用于那些需要长期在后台运行的定时任务
*/
private void useTimer(){
stopTimer();
timer = new Timer();
timerTask = new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
showUI();
}
});
}
};
timer.schedule(timerTask,3000);
}
private void stopTimer(){
if(timerTask != null){
timerTask.cancel();
timerTask = null;
}
if(timer != null){
timer.cancel();
timer = null;
}
}
5、AlarmManager
使用起来比较麻烦，但很精准，不太会用这货
private void userAlarmManager(){
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY,17);
calendar.set(Calendar.MINUTE,11);
Intent intent = new Intent("com.xmliu.mytimerdemo.BlockReceiver");
PendingIntent pendingIntent = PendingIntent.getBroadcast(this,0,intent,0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),10*1000,pendingIntent);
}
全部代码
package com.xmliu.mytimerdemo;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity {
private Timer timer;
private TimerTask timerTask;
private Handler handler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// useTimer();
// useHandler1();
// userHandler2();
// useThread();
userAlarmManager();
}
private void showUI(){
TextView textView = findViewById(R.id.text);
textView.setText("timer示例");
}
/**
* 在17：11之后，每分钟的执行一次
*/
private void userAlarmManager(){
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY,17);
calendar.set(Calendar.MINUTE,11);
Intent intent = new Intent("com.xmliu.mytimerdemo.BlockReceiver");
PendingIntent pendingIntent = PendingIntent.getBroadcast(this,0,intent,0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),10*1000,pendingIntent);
}
/**
* 建议使用优先级：4
*/
private void useThread(){
Thread thread = new Thread(){
@Override
public void run() {
super.run();
try {
Thread.sleep(12000);
runOnUiThread(new Runnable() {
@Override
public void run() {
showUI();
}
});
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
thread.start();
}
/**
* 建议使用优先级：2
*/
private void userHandler2(){
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what){
case 1000:
showUI();
break;
default:
break;
}
}
};
handler.sendEmptyMessageDelayed(1000,9000);
}
/**
* 建议使用优先级：1
*/
private void useHandler1(){
handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
showUI();
}
},6000);
}
/**
* 建议使用优先级：3
* 简单应用场合，但不适用于那些需要长期在后台运行的定时任务
*/
private void useTimer(){
stopTimer();
timer = new Timer();
timerTask = new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
showUI();
}
});
}
};
timer.schedule(timerTask,3000);
}
private void stopTimer(){
if(timerTask != null){
timerTask.cancel();
timerTask = null;
}
if(timer != null){
timer.cancel();
timer = null;
}
}
}
package com.xmliu.mytimerdemo;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
/**
* Date: 2019/6/17 17:08
* Email: [email protected]
* Author: diyan
* Description: TODO
*/
public class BlockReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Log.i("xunming","-----BlockReceiver-------");
}
}