Android根据包名取得指定程序包的信息（名称、图标……）

Android根据包名取得指定程序包的信息（名称、图标……）

本文讨论如何根据包名取得程序包相关信息，本例演示取得Android系统程序的名称和图标（注意：并不是每一个程序包都有程序名称和图标）。

效果图如下：

主程序源码如下：

package com.plter.getsystemicon;

import android.app.Activity;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class P0001_GetSystemIconActivity extends Activity {

   private ImageView appIconIv;
   private TextView appNameTv;
   private LinearLayout.LayoutParams llp=new LinearLayout.LayoutParams(-2, -2);
   private LinearLayout mainLayout;

   private PackageManager pm;
   private ApplicationInfo appInfo;
   private Drawable appIcon;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mainLayout=(LinearLayout) findViewById(R.id.mainLayout);

        appNameTv=new TextView(this);
        mainLayout.addView(appNameTv, llp);

        appIconIv=new ImageView(this);
        mainLayout.addView(appIconIv, llp);

        pm=getPackageManager();
        try {
           appInfo=pm.getApplicationInfo("system", PackageManager.GET_META_DATA);

           appNameTv.setText(pm.getApplicationLabel(appInfo));

           appIcon=pm.getApplicationIcon(appInfo);
           appIconIv.setImageDrawable(appIcon);

       } catch (NameNotFoundException e) {
           e.printStackTrace();
       }
    }
}

main.xml布局文件源码如下：

<?xml version="1.0" encoding="utf-8"?>
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/mainLayout"
    >

AndroidManifest.xml文件源码如下：

<?xml version="1.0" encoding="utf-8"?>
      package="com.plter.getsystemicon"
      android:versionCode="1"
      android:versionName="1.0">

                          android:label="@string/app_name">

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