android延时处理任务范例

今天要做一个任务，要求图片做按钮开关，点击出发相应事件。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。下面将主要代码附上。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>  

延时处理要用到以下代码

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

java代码MainActivity.java如下：

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; // 按钮置换
	@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();  

		        } 

			}
		}));

	}

	//开始
	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;
	}  

}

效果图如下：运行后先出现以下界面

，点击该蓝色图片后，

android延时处理任务范例