安卓handler学习

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安卓handler学习

MainActivity

package ray.com.handler;import android.os.Handler;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;public class MainActivity extends AppCompatActivity {    private Button startButton = null;    private Button endButton = null;    private int i=0 ;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        final Handler handler = new Handler();        startButton = (Button) findViewById(R.id.button1);        endButton = (Button) findViewById(R.id.button2);        final Runnable runnable = new Runnable() {            @Override            public void run() {                System.out.println("Threadrun:"+i);                handler.postDelayed(this,1000);                i++;            }        };        startButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                handler.post(runnable);                i=0;            }        });        endButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                handler.removeCallbacks(runnable);                System.out.println("Thread was killed!!!");            }        });    }}

activity_main

<?xml version="1.0" encoding="utf-8"?><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="ray.com.handler.MainActivity">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/button1"        android:layout_marginTop="87dp"        android:text="start"        android:layout_alignStart="@+id/button2" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="end"        android:layout_below="@+id/button1"        android:layout_centerHorizontal="true"        android:layout_marginTop="99dp"        android:id="@+id/button2" /></RelativeLayout>

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