Android中Market的Loading效果实现方法

2020-04-11 11:22:56

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本文实例讲述了Android中Market的Loading效果实现方法。分享给大家供大家参考。具体如下：

在Android中,要实现Loading效果，一般情况下都使用ProgressDialog控件。ApiDemos/src/com/example/android/apis/view/ProgressBar3.java 提供两个demo:

仔细看了Android Market，发现却是不一样的，请看截图:

那到底如何实现呢？首先，我们创建一个布局文件,
res/layout/fullscreen_loading_indicator.xml, 其内容如下:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:gravity="center_vertical|center_horizontal"  android:orientation="horizontal"  android:id="@+id/fullscreen_loading_style"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  > <ProgressBar  android:layout_gravity="center_vertical"android:layout_width="wrap_content"android:layout_height="wrap_content"style="?android:attr/progressBarStyleSmall"/><TextView  android:id="@+id/current_action"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_marginLeft="5.0dip"  android:text="@+string/loading"/></LinearLayout>

然后在main.xml 把它include 进来

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical" android:layout_width="fill_parent"  android:layout_height="fill_parent">  <LinearLayout android:orientation="vertical"     android:id="@+id/main_info"    android:visibility="gone"     android:layout_width="fill_parent"    android:layout_height="fill_parent">    <TextView android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:text="abc"></TextView>  </LinearLayout>  <LinearLayout android:orientation="vertical"     android:id="@+id/main_Loading"    android:layout_width="fill_parent"    android:layout_height="fill_parent">    <include android:visibility="visible"       android:layout_width="fill_parent"      android:layout_height="fill_parent"       layout="@layout/fullscreen_loading_style" />  </LinearLayout></LinearLayout>

主程序：

package com.tymx.fullloading;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.LinearLayout;public class myFullLoading extends Activity {  /** Called when the activity is first created. */  private LinearLayout mLoadingLayout;  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    final Handler handler = new Handler(){      @Override      public void handleMessage(Message msg) {        // TODO Auto-generated method stub        super.handleMessage(msg);        if (msg.what==1){          mLoadingLayout = (LinearLayout)findViewById(R.id.fullscreen_loading_style);          mLoadingLayout.setVisibility(View.GONE);          LinearLayout mMain = (LinearLayout)findViewById(R.id.main_info);          mMain.setVisibility(View.VISIBLE);        }      }    };    new Thread(){      public void run(){        for (int i=0;i<1000;i++){          System.out.print(i+"");        }        Message msg = handler.obtainMessage(1,"flash");        handler.sendMessage(msg);      }    }.start();  }}

运行的效果为: