点击button暂停
public class MainActivity extends AppCompatActivity {@BindView(R.id.button)Button button;@BindView(R.id.first_textview)TextView textView;Handler mHandler;volatile boolean flag=true;Object object=new Object();MThread mThread;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ButterKnife.bind(this);textView.setText(String.valueOf(1));mHandler=new Handler(){@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);textView.setText(String.valueOf(msg.what));}};mThread=new MThread();mThread.start();button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if(!mThread.isAlive()){mThread=new MThread();mThread.start();return;}if(flag==true){flag=!flag;}else{synchronized (object){flag=!flag;object.notify();}}}});}public class MThread extends Thread{@Overridepublic void run() {System.out.println("enter thread");for(int i=20;i>=0;i--){if(flag==false){synchronized (object) {try {object.wait();} catch (InterruptedException e) {e.printStackTrace();}}}System.out.println(i);mHandler.sendEmptyMessage(i);try {sleep(500);} catch (InterruptedException e) {e.printStackTrace();}}}}}
两个handler：
public class MainActivity extends AppCompatActivity {@BindView(R.id.button)Button button;@BindView(R.id.textview)TextView textView;Handler mFirstHandler;Handler mSecondHandler;volatile boolean flag = true;Object object = new Object();SecondThread mThread;FirstThread mFirstThread;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity);ButterKnife.bind(this);textView.setText(String.valueOf(1));mSecondHandler = new Handler(new Handler.Callback() {@Overridepublic boolean handleMessage(Message msg) {textView.setText(String.valueOf(msg.what));return true;}});mThread = new SecondThread();mThread.start();mFirstThread = new FirstThread();mFirstThread.start();}public class SecondThread extends Thread {@Overridepublic void run() {Looper.prepare();Looper.loop();System.out.println("*****************");mFirstHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {mSecondHandler.sendEmptyMessage(msg.what);}};}}public class FirstThread extends Thread {@Overridepublic void run() {System.out.println("enter first thread");for (int i = 20; i >= 0; i--) {Message message = Message.obtain();message.what = i;try {Thread.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}mFirstHandler.sendMessage(message);}}}}
使用ThreadHandler
public class MainActivity extends AppCompatActivity {@BindView(R.id.button)Button button;@BindView(R.id.textview)TextView textView;Handler mFirstHandler;Handler mSecondHandler;Thread t=new FirstThread();volatile boolean flag = true;Object object = new Object();HandlerThread handlerThread; @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity);ButterKnife.bind(this);textView.setText(String.valueOf(1));mSecondHandler = new Handler(new Handler.Callback() {@Overridepublic boolean handleMessage(Message msg) {textView.setText(String.valueOf(msg.what));return true;}});handlerThread=new HandlerThread("1");handlerThread.start();mFirstHandler=new Handler(handlerThread.getLooper()){@Overridepublic void handleMessage(Message msg) {mSecondHandler.sendEmptyMessage(msg.what);}};t.start();}public class FirstThread extends Thread {@Overridepublic void run() {System.out.println("enter first thread");for (int i = 20; i >= 0; i--) {Message message = Message.obtain();message.what = i;try {Thread.sleep(500);} catch (InterruptedException e) {e.printStackTrace();}mFirstHandler.sendMessage(message);}}}}
