android延时处理任务范例

今天要做一个任务，要求图片做button开关，点击出发对应事件。点击打开，图片左边显示几行字体，这几行字体是延时显示的。以下将主要代码附上。以下是main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="6">
<LinearLayout
android:orientation="vertical"
android:layout_width="80dp"
android:layout_height="fill_parent"
android:gravity="center"
android:layout_weight="2.5">

<TextView
android:id="@+id/txtView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textColor="#ff00"
android:textSize="20sp"/>
<TextView
android:id="@+id/txtView02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textColor="#999933"
android:textSize="20sp"/>
<TextView
android:id="@+id/txtView03"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textColor="#ff33cc"
android:textSize="20sp"/>
<TextView
android:id="@+id/txtView04"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textColor="#993399"
android:textSize="20sp"/>

</LinearLayout>

<ImageView
android:id="@+id/start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/blue"
android:layout_gravity="center"
android:layout_weight="1"
/>

<LinearLayout
android:orientation="vertical"
android:layout_width="80dp"
android:layout_height="fill_parent"
android:gravity="center"
android:layout_weight="2.5">
<TextView
android:id="@+id/txtView05"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textColor="#ff6666"
android:textSize="20sp"
/>

<TextView
android:id="@+id/txtView06"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:text=""
android:textColor="#003366"
android:textSize="20sp"
/>

</LinearLayout>

</LinearLayout>

延时处理要用到下面代码

new Handler().postDelayed(new Runnable(){
public void run() {
//execute the task
}
}, delay);

java代码MainActivity.java例如以下：

package com.example.vieweffect;

import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.os.Build;

public class MainActivity extends Activity {
TextView txtview01;
TextView txtview02;
TextView txtview03;
TextView txtview04;

TextView txtview05;
TextView txtview06;
private ImageView start =null;
protected boolean isBrewing = false; // button置换
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

txtview01=(TextView)findViewById(R.id.txtView01);
txtview02=(TextView)findViewById(R.id.txtView02);
txtview03=(TextView)findViewById(R.id.txtView03);
txtview04=(TextView)findViewById(R.id.txtView04);

txtview05=(TextView)findViewById(R.id.txtView05);
txtview06=(TextView)findViewById(R.id.txtView06);

start=(ImageView)findViewById(R.id.start);
start.setOnClickListener((new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub

if(v==start){
if(isBrewing)
stopView();
else
startView();

}

}
}));

}

//開始
public void startView(){
Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.stop);//打开资源图片
start.setImageBitmap(bmp);
txtview01.setText("打开串口...");
new Handler().postDelayed(new Runnable(){
public void run() {
//execute the task
txtview02.setText("打开A...");
}
}, 500);

new Handler().postDelayed(new Runnable(){
public void run() {
//execute the task
txtview03.setText("打开B...");
}
}, 1000);

new Handler().postDelayed(new Runnable(){
public void run() {
//execute the task
txtview04.setText("打开C...");
}
}, 1500);

isBrewing = true;
}

//停止
public void stopView(){
Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.blue);//打开资源图片
start.setImageBitmap(bmp);
txtview01.setText("");
txtview02.setText("");
txtview03.setText("");
txtview04.setText("");

txtview05.setText("");
txtview06.setText("");
isBrewing = false;
}

}

效果图例如以下：执行后先出现下面界面


，点击该蓝色图片后

，