android延時處理任務範例

標籤：android   延時處理   

今天要做一個任務，要求圖片做按鈕開關，點擊出發相應事件。點擊開啟，圖片左邊顯示幾行字型，這幾行字型是延時顯示的。下面將主要代碼附上。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>  

延時處理要用到以下代碼

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

java代碼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; // 按鈕置換@Overrideprotected 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() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif(v==start){              if(isBrewing)                  stopView();              else                  startView();                        } }}));}//開始  public void startView(){  Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.stop);//開啟資源圖片             start.setImageBitmap(bmp);           txtview01.setText("開啟串口...");        new Handler().postDelayed(new Runnable(){              public void run() {              //execute the task              txtview02.setText("開啟A...");            }           }, 500);                 new Handler().postDelayed(new Runnable(){              public void run() {              //execute the task              txtview03.setText("開啟B...");            }           }, 1000);                 new Handler().postDelayed(new Runnable(){              public void run() {              //execute the task              txtview04.setText("開啟C...");            }           }, 1500);                 isBrewing = true;  }  //停止  public void stopView(){  Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.blue);//開啟資源圖片             start.setImageBitmap(bmp);           txtview01.setText("");        txtview02.setText("");        txtview03.setText("");        txtview04.setText("");                txtview05.setText("");        txtview06.setText("");        isBrewing = false;  }  }

如下：運行後先出現以下介面

，點擊該藍色圖片後，