Android_handler_TextView

Android_handler_textView

package com.jing.example.nknu_.android_handler_textview;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class android_handler_textview extends AppCompatActivity {

private Button button;

private TextView textView;

private MyHandler handler;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_android_handler_textview);

button = (Button)this.findViewById(R.id.button);

textView = (TextView)this.findViewById(R.id.msg);

handler = new MyHandler();

button.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

new Thread(new MyThread()).start();

}

});

}

public class MyHandler extends Handler {

@Override

public void handleMessage(Message msg){

super.handleMessage(msg);

int arg1 = msg.arg1;

String name = (String)msg.obj;

textView.append(name+arg1);

}

}

public class MyThread implements Runnable{

int count = 0;

@Override

public void run() {

while(count <= 20){

try {

Thread.sleep(500);

} catch(Exception e){

e.printStackTrace();

}

//從消息池中獲取消息，如果沒有消息，創建一個消息，如果有，則取出來消息攜帶數據，由handler發送

Message message = Message.obtain();

message.arg1 = count;

message.obj = "jack";

count ++ ;

handler.sendMessage(message);

}

}

}

}

content_android_handler_textView.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout 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"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

app:layout_behavior="@string/appbar_scrolling_view_behavior"

tools:context="com.jing.example.nknu_.android_handler_textview.android_handler_textview"

tools:showIn="@layout/activity_android_handler_textview">

<TextView

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="New Text"

android:id="@+id/msg"

android:layout_alignParentTop="true"

android:layout_alignParentStart="true" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="更新TextView信息"

android:id="@+id/button"

android:layout_alignParentBottom="true"

android:layout_centerHorizontal="true"

android:layout_marginBottom="143dp" />

</RelativeLayout>