onTouchEvent在DOWN事件里发送多条相同数据和UP里终止线程

最新推荐文章于 2023-02-23 15:29:37 发布

原创最新推荐文章于 2023-02-23 15:29:37 发布 · 439 阅读

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本文介绍了一个Android应用中如何使用触摸事件控制定时任务的运行与停止。通过MainActivity类实现了一个按钮的触摸监听，当按下按钮时启动一个每秒执行的任务并在日志中输出信息，当手指抬起时停止该任务。

package com.example.administrator.myapplication;

import android.os.Handler;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;


public class MainActivity extends AppCompatActivity {

    private Handler handler = new Handler();
//    boolean on = false;
    boolean off = false;

    private Runnable runnable = new Runnable() {

        public void run() {
            handler.postDelayed(this,1000);
           Log.d("MainActivity", "hehe");

        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Button tv = (Button) findViewById(R.id.tv);
        tv.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch(event.getAction()){
                    case MotionEvent.ACTION_DOWN:
//                        on = false;

                            handler.postDelayed(runnable,1000);


                        off =true;
                        break;
                    case MotionEvent.ACTION_UP:

                        if (off)
                            handler.removeCallbacks(runnable);
                        break;
                    default:
                        break;
                }
                return false;
            }
        });

    }

}