andriod studio 定时器启动显示和停止的例子

1安卓点击按钮定时器启动显示和停止的例子

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下载链接：http://download.csdn.net/download/chencaw/10256340

2资源代码

xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.lenovo.chentimer.MainActivity">

    <Button
        android:id="@+id/button_start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="44dp"
        android:layout_marginTop="32dp"
        android:text="启动"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="134dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="0"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        tools:layout_editor_absoluteY="112dp" />

    <Button
        android:id="@+id/button_stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:text="停止"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/button_start"
        app:layout_constraintTop_toTopOf="parent" />
android.support.constraint.ConstraintLayout>

3 程序代码

package com.example.lenovo.chentimer;

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

import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {
    private static String TAG = "TimerDemo";
    private Button btstart = null;
    private Button btstop = null;
    private TextView texttime = null;
   // Handler handler = new Handler();
   // private boolean chenflag = false;
  //  Runnable runnable =null;

    private Timer mTimer = null;
    private TimerTask mTimerTask = null;
    private Handler mHandler = null;
    private static int count = 0;
    private boolean isPause = false;
    private boolean isStop = true;
    private static int delay = 1000; //1s
    private static int period = 1000; //1s
    private static final int UPDATE_TEXTVIEW = 0;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btstart = (Button) findViewById(R.id.button_start);
        btstop = (Button) findViewById(R.id.button_stop);
        texttime = (TextView) findViewById(R.id.editText);

        btstart.setOnClickListener(listener);
        btstop.setOnClickListener(listener);
        btstop.setEnabled(false);

        mHandler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what) {
                    case UPDATE_TEXTVIEW:
                        updateTextView();
                        break;
                    default:
                        break;
                }
            }
        };

    }
    private View.OnClickListener listener = new View.OnClickListener() {
        public void onClick(View v) {
                if (v == btstart)
                {
                    startTimer();
                    btstart.setEnabled(false);
                    btstop.setEnabled(true);
                }
                if (v == btstop)
                {
                    stopTimer();
                    btstart.setEnabled(true);
                    btstop.setEnabled(false);
                }
            }
    };

    private void startTimer(){
        if (mTimer == null)
        {
            mTimer = new Timer();
        }
        if (mTimerTask == null) {
            mTimerTask = new TimerTask() {
                @Override
                public void run() {
                    Log.i(TAG, "count: "+String.valueOf(count));
                    sendMessage(UPDATE_TEXTVIEW);
                    do {
                        try {
                            Log.i(TAG, "sleep(1000)...");
                            Thread.sleep(1000);
                        } catch (InterruptedException e) {
                        }
                    } while (isPause);
                    count ++;
                }
            };
        }

        if(mTimer != null && mTimerTask != null )
            mTimer.schedule(mTimerTask, delay, period);

    }
    private void stopTimer(){
        if (mTimer != null) {
            mTimer.cancel();
            mTimer = null;
        }
        if (mTimerTask != null) {
            mTimerTask.cancel();
            mTimerTask = null;
        }
        count = 0;
    }
    public void sendMessage(int id){
        if (mHandler != null) {
            Message message = Message.obtain(mHandler, id);
            mHandler.sendMessage(message);
        }
    }


    private void updateTextView(){
        texttime.setText(String.valueOf(count));
    }
}