Android之ConditionVariable使用

public class MainActivity extends Activity implements OnClickListener {
    private Button btn_output;
    private TextView textView;
    private MyHandler mHandler;
    private boolean isStart;
    private String str = "";
    private ConditionVariable mConditionVariable;
    private final int REFRESHTEXT = 1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

                // 获取按钮
        btn_output = (Button) findViewById(R.id.btn);
        btn_output.setOnClickListener(this);
        textView = (TextView) findViewById(R.id.txt);
        mHandler = new MyHandler();
        mConditionVariable = new ConditionVariable();
        isStart = true;
        new Thread(new Runnable() {
            @Override
            public void run() {
                // TODO Auto-generated method stub
                while(isStart) {
                    //延时等待3秒
                    mConditionVariable.block(3000);
                    //如果是点击了按钮，则先将条件重置，否则block会失效
                    mConditionVariable.close();
                    //线程唤醒后通知主线程更新TextView的文本
                    mHandler.sendEmptyMessage(REFRESHTEXT);
                }
            }
        }).start();
    }
 
    private class MyHandler extends Handler {
        public void handleMessage(Message msg) {
            switch(msg.what) {
            case REFRESHTEXT:
                textView.setText(str += 's');
                break;
            }
        }
    }
    
    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        mConditionVariable.open();
    }
 
    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        isStart = false;
    }
}