[embedyt]https://www.youtube.com/watch?v=TN-CGfzvBhc[/embedyt]
activity_main.xmlMainActivity.javaExampleLooperThread.javaExampleHandler.java
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical" tools:context="com.codinginflow.looperthreadexample.MainActivity"> <Button android:id="@+id/button_start" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="startThread" android:text="Start" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="stopThread" android:text="Stop" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="taskA" android:text="Task A" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="taskB" android:text="Task B" /> </LinearLayout>
package com.codinginflow.looperthreadexample; 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.view.View; import static com.codinginflow.looperthreadexample.ExampleHandler.TASK_A; import static com.codinginflow.looperthreadexample.ExampleHandler.TASK_B; public class MainActivity extends AppCompatActivity { private static final String TAG = "MainActivity"; private ExampleLooperThread looperThread = new ExampleLooperThread(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void startThread(View view) { looperThread.start(); } public void stopThread(View view) { looperThread.looper.quit(); } public void taskA(View view) { Message msg = Message.obtain(); msg.what = TASK_A; looperThread.handler.sendMessage(msg); /*Handler threadHandler = new Handler(looperThread.looper); threadHandler.post(new Runnable() { @Override public void run() { for (int i = 0; i < 5; i++) { Log.d(TAG, "run: " + i); SystemClock.sleep(1000); } } });*/ } public void taskB(View view) { Message msg = Message.obtain(); msg.what = TASK_B; looperThread.handler.sendMessage(msg); } }
package com.codinginflow.looperthreadexample; import android.os.Handler; import android.os.Looper; import android.util.Log; public class ExampleLooperThread extends Thread { private static final String TAG = "ExampleLooperThread"; public Looper looper; public Handler handler; @Override public void run() { Looper.prepare(); looper = Looper.myLooper(); handler = new ExampleHandler(); Looper.loop(); Log.d(TAG, "End of run()"); } }
package com.codinginflow.looperthreadexample; import android.os.Handler; import android.os.Message; import android.util.Log; public class ExampleHandler extends Handler { private static final String TAG = "ExampleHandler"; public static final int TASK_A = 1; public static final int TASK_B = 2; @Override public void handleMessage(Message msg) { switch (msg.what) { case TASK_A: Log.d(TAG, "Task A executed"); break; case TASK_B: Log.d(TAG, "Task B executed"); break; } } }