package com.example.wang.testapp2;
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;
import android.widget.Toast;
import java.util.Random;
public class TestActivity6
extends AppCompatActivity {
TextView tv_3,tv_5;
TextView tv_4,tv_6;
Button bt_4,bt_5,bt_3;
//定义 Handler,Handler在子线程里发消息，在主线程里处理消息，所以需要定义为全局变量
Handler h=
new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
//处理消息
if (msg.what==1
)
{
String m=
msg.obj.toString();
tv_5.setText(tv_5.getText()+" "+
m);
}
if (msg.what==2
)
{
tv_5.setText(tv_5.getText()+" 空消息"
);
}
}
};
int i=10
;
Handler hl=
new Handler()
{
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what)
{
case 1
:
if (i==20
)
{
bt_3.setEnabled(false);
bt_5.setEnabled(false);
return;
}
i++
;
tv_6.setText(i + ""
);
//发送
hl.sendEmptyMessageDelayed(1, 1000
);
hl.removeMessages(2
);
bt_3.setEnabled(false);
bt_4.setEnabled(true);
bt_5.setEnabled(true);
break;
case 2
:
if (i==1
)
{
bt_4.setEnabled(false);
bt_5.setEnabled(false);
return;
}
i--
;
tv_6.setText(i + ""
);
//发送
hl.sendEmptyMessageDelayed(2, 1000
);
hl.removeMessages(1
);
bt_3.setEnabled(true);
bt_4.setEnabled(false);
bt_5.setEnabled(true);
break;
case 3
:
hl.removeMessages(1
);
hl.removeMessages(2
);
bt_3.setEnabled(true);
bt_4.setEnabled(true);
bt_5.setEnabled(false);
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test6);
tv_3=
(TextView)findViewById(R.id.tv_3);
tv_4=
(TextView)findViewById(R.id.tv_4);
tv_5=
(TextView)findViewById(R.id.tv_5);
tv_6=
(TextView)findViewById(R.id.tv_6);
bt_4=
(Button)findViewById(R.id.bt_4);
bt_5=
(Button)findViewById(R.id.bt_5);
bt_3=
(Button)findViewById(R.id.bt_3);
bt_5.setEnabled(false);
}
public void bt3_OnClick(View v)
{
switch (v.getId())
{
case R.id.bt_3:
//发送增加的消息
hl.sendEmptyMessage(1
);
break;
case R.id.bt_4:
//发送减少的消息
hl.sendEmptyMessage(2
);
break;
case R.id.bt_5:
//发送暂停的消息
hl.sendEmptyMessage(3
);
break;
//default:
}
}
public void bt2_OnClick(View v)
{
//启动线程
new Thread(){
@Override
public void run() {
//发送消息
//1-创建Message
Message m=
Message.obtain();
m.what=1
;
m.obj="新信息1"
;
//2-发送即时消息
h.sendMessage(m);
//发送延时消息
m=
Message.obtain();
m.what=1
;
m.obj="新消息2"
;
h.sendMessageDelayed(m,2000
);
//发送空消息
h.sendEmptyMessage(2
);
//发送延时空消息
h.sendEmptyMessageDelayed(2,3000
);
}
}.start();
}
public void bt1_OnClick(View v) {
//创建子线程1
new Thread() {
@Override
public void run() {
for (
int i = 0; i < 10; i++
)
{
try {
//暂停一下，时间随机
Thread.sleep(
new Random().nextInt(2000
));
} catch (Exception e) {}
runOnUiThread(new Runnable() {
@Override
public void run() {
tv_3.setText(tv_3.getText()+" 北京"
);
}
});
}
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestActivity6.this, "北京 循环结束"
, Toast.LENGTH_SHORT).show();
}
});
}
}.start();
new Thread(
new Runnable() {
@Override
public void run() {
for (
int i = 0; i < 10; i++
)
{
runOnUiThread(new Runnable() {
@Override
public void run() {
tv_4.setText(tv_4.getText()+" 上海"
);
}
});
try {
//暂停一下，时间随机
Thread.sleep(
new Random().nextInt(2000
));
} catch (Exception e) {}
}
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(TestActivity6.this, "上海 循环结束"
, Toast.LENGTH_SHORT).show();
}
});
}
}).start();
}
}
java
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="com.example.wang.testapp2.TestActivity6"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="北京"
android:id="@+id/tv_3"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="上海"
android:id="@+id/tv_4"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="启动"
android:onClick="bt1_OnClick"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_5"
android:text="接收的消息"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="发消息"
android:onClick="bt2_OnClick"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv_6"
android:text="10"
android:layout_gravity="center"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="增加"
android:onClick="bt3_OnClick"
android:id="@+id/bt_3"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="减少"
android:onClick="bt3_OnClick"
android:id="@+id/bt_4"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="暂停"
android:onClick="bt3_OnClick"
android:id="@+id/bt_5"/>
</LinearLayout>
xml
转载于:https://www.cnblogs.com/wangchuanqi/p/5499943.html
