Android – Demo（三） 循环任务的三种实现方法：Timer， Thread, Handler

源代码：

public class Demo_Loop_Task_Activity extends AppCompatActivity implements View.OnClickListener {
private static final long INTERVAL_TIMER = 3 * 1000l;
private static final long INTERVAL_THREAD = 5 * 1000l;
private static final long INTERVAL_HANDLER = 7 * 1000l;
private static final int MSG_CODE_TASK = 0;
private static final int MSG_CODE_ADD_LOG = 1;
private TextView tvLog;
private Button bStartTimer, bStartThread, bStartHandler;
private Button bStopTimer, bStopThread, bStopHandler;
private Timer timer;
private TimerTask timerTask;
private boolean cancelThread = true;
private StringBuilder builder;
private final String FORMAT = "hh:MM:ss";
private final String[] cont = {"冒个泡", "踢个球", "摸个头", "遛个狗", "吹个牛"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_demo__loop__task_);
init();
setListener();
}
private void init() {
builder = new StringBuilder();
tvLog = findViewById(R.id.tvLog);
bStartTimer = findViewById(R.id.bStartTimer);
bStartThread = findViewById(R.id.bStartThread);
bStartHandler = findViewById(R.id.bStartHandler);
bStopTimer = findViewById(R.id.bStopTimer);
bStopThread = findViewById(R.id.bStopThread);
bStopHandler = findViewById(R.id.bStopHandler);
}
private void setListener() {
bStartTimer.setOnClickListener(this);
bStartThread.setOnClickListener(this);
bStartHandler.setOnClickListener(this);
bStopTimer.setOnClickListener(this);
bStopThread.setOnClickListener(this);
bStopHandler.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.bStartTimer:
startTimer();
bStartTimer.setEnabled(false);
bStopTimer.setEnabled(true);
break;
case R.id.bStopTimer:
stopTimer();
bStartTimer.setEnabled(true);
bStopTimer.setEnabled(false);
break;
case R.id.bStartThread:
startThread();
bStartThread.setEnabled(false);
bStopThread.setEnabled(true);
break;
case R.id.bStopThread:
stopThread();
bStartThread.setEnabled(true);
bStopThread.setEnabled(false);
break;
case R.id.bStartHandler:
startHandler();
bStartHandler.setEnabled(false);
bStopHandler.setEnabled(true);
break;
case R.id.bStopHandler:
stopHandler();
bStartHandler.setEnabled(true);
bStopHandler.setEnabled(false);
break;
}
}
private void addLog(String log){
builder.append(log);
builder.append("n");
Message message = Message.obtain();
message.what = MSG_CODE_ADD_LOG;
message.obj = builder.toString();
handler.sendMessage(message);
}
//获取随机数: [0,4]
private int getRandom() {
return (int) (Math.random() * 4);
}
private void startTimer() {
addLog("Start Timer Task...");
if(timer==null){
timer = new Timer();
}
if(timerTask==null){
timerTask = new TimerTask() {
@Override
public void run() {
//do thing
addLog("Timer: " + cont[getRandom()] + ", " + DateUtil.long2String(System.currentTimeMillis(), FORMAT));
}
};
}
timer.schedule(timerTask, 0, INTERVAL_TIMER);
}
private void stopTimer() {
if(timer!=null || timerTask!=null){
timer.cancel();
timer = null;
timerTask.cancel();
timerTask = null;
addLog("Stop Timer Task...");
}else{
addLog("The Timer Task hasn't started!");
}
}
private void startThread() {
addLog("Start Thread Task...");
if(cancelThread){
cancelThread = false;
}
//无法在非ui线程中直接控制ui
new Thread(){
@Override
public void run() {
super.run();
while(!cancelThread){
try {
addLog("Thread: " + cont[getRandom()] + ", " + DateUtil.long2String(System.currentTimeMillis(), FORMAT));
Thread.sleep(INTERVAL_THREAD);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}.start();
}
private void stopThread() {
if(!cancelThread){
cancelThread = true;
addLog("Stop Thread Task...");
}else{
addLog("The Thread Task hasn't started!");
}
}
private void startHandler() {
handler.post(task);
addLog("Start Handler Task...");
}
private void stopHandler() {
handler.removeCallbacks(task);
addLog("Stop Handler Task...");
}
private Runnable task = new Runnable() {
@Override
public void run() {
handler.sendEmptyMessage(MSG_CODE_TASK);
handler.postDelayed(task, INTERVAL_HANDLER);
}
};
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what){
case MSG_CODE_TASK:
addLog("Handler: " + cont[getRandom()] + ", " + DateUtil.long2String(System.currentTimeMillis(), FORMAT));
break;
case MSG_CODE_ADD_LOG:
tvLog.setText((String)msg.obj);
break;
}
}
};
}

最后

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