Android进阶学习-查看手机上安装的APP信息

效果图:





在获取应用之前 我们需要提一下两个类:

①PackageManager //在Android系统中负责管理所有已经安装的APP

②ApplicationInfo //一种bean,用来存储App的信息

想应用起来下面就可以编码啦,直接就上用法咯:

item_package.xml布局文件

[code=language-xml]<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >

<ImageView
android:id="@+id/icon"
android:layout_width="50dp"
android:layout_height="50dp" />

<LinearLayout
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_weight="1"
android:orientation="vertical" >

<TextView
android:id="@+id/labelName"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />

<TextView
android:id="@+id/packageName"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>

<ImageView
android:id="@+id/logo"
android:layout_width="50dp"
android:layout_height="50dp" />

</LinearLayout>

PMActivity代码:

还有就是ApplicationInfo类里面有个flags属性,可以根据它跟一些内置的常量作位运算来判断:

app.flags & ApplicationInfo.FLAG_SYSTEM) == 1 //系统应用,反之是第三方

app.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) == 1 //通过升级,从系统应用变成第三方应用

app.flags & ApplicationInfo.FLAG_EXTERNAL_STORAGE) == 1 //安装在外置SD卡,反之安装在内置SD卡

[code=language-java]package com.example.customview;

import java.util.List;

import android.app.Activity;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class PMActivity extends Activity {

List	listApplications;
ListView				mListView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pm);
mListView = (ListView) findViewById(R.id.mListView);
listApplications = getPackageManager().getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES);
mListView.setAdapter(new PMAdapter());
}

class PMAdapter extends BaseAdapter {

@Override
public int getCount() {
return listApplications.size();
}

@Override
public Object getItem(int position) {
return listApplications.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
convertView = getLayoutInflater().inflate(R.layout.item_package, parent, false);
holder = new ViewHolder();
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
holder.logo = (ImageView) convertView.findViewById(R.id.logo);
holder.packageName = (TextView) convertView.findViewById(R.id.packageName);
holder.labelName = (TextView) convertView.findViewById(R.id.labelName);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.icon.setImageDrawable(listApplications.get(position).loadIcon(getPackageManager()));
holder.logo.setImageDrawable(listApplications.get(position).loadLogo(getPackageManager()));
holder.packageName.setText(listApplications.get(position).packageName);

String source = "";
if ((listApplications.get(position).flags & ApplicationInfo.FLAG_SYSTEM) == 1) {
source = "系统";
} else {
source = "第三方";
}

if ((listApplications.get(position).flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) == 1) {
source = source + ",Upldate->No-System";
}

if ((listApplications.get(position).flags & ApplicationInfo.FLAG_EXTERNAL_STORAGE) == 1) {
source = source + ",In External SD";
} else {
source = source + ",In Internal SD";
}

holder.labelName
.setText(listApplications.get(position).loadLabel(getPackageManager()) + "(" + source + ")");

Log.i("INFOTAG", (String) listApplications.get(position).loadLabel(getPackageManager()));
Log.i("INFOTAG", "-----backupAgentName:" + listApplications.get(position).backupAgentName);
Log.i("INFOTAG", "-----compatibleWidthLimitDp:" + listApplications.get(position).compatibleWidthLimitDp);
Log.i("INFOTAG", "-----className:" + listApplications.get(position).className);
Log.i("INFOTAG", "-----dataDir:" + listApplications.get(position).dataDir);
Log.i("INFOTAG", "-----descriptionRes:" + listApplications.get(position).descriptionRes);
Log.i("INFOTAG", "-----flags:" + listApplications.get(position).flags);
Log.i("INFOTAG", "-----labelRes:" + listApplications.get(position).labelRes);
Log.i("INFOTAG", "-----largestWidthLimitDp:" + listApplications.get(position).largestWidthLimitDp);
Log.i("INFOTAG", "-----manageSpaceActivityName:" + listApplications.get(position).manageSpaceActivityName);
Log.i("INFOTAG", "-----name:" + listApplications.get(position).name);
Log.i("INFOTAG", "-----nativeLibraryDir:" + listApplications.get(position).nativeLibraryDir);
Log.i("INFOTAG", "-----permission:" + listApplications.get(position).permission);
Log.i("INFOTAG", "-----processName:" + listApplications.get(position).processName);
Log.i("INFOTAG", "-----publicSourceDir:" + listApplications.get(position).publicSourceDir);
Log.i("INFOTAG", "-----requiresSmallestWidthDp:" + listApplications.get(position).requiresSmallestWidthDp);
Log.i("INFOTAG", "-----sourceDir:" + listApplications.get(position).sourceDir);
Log.i("INFOTAG", "-----targetSdkVersion:" + listApplications.get(position).targetSdkVersion);
Log.i("INFOTAG", "-----taskAffinity:" + listApplications.get(position).taskAffinity);
Log.i("INFOTAG", "-----uid:" + listApplications.get(position).uid);
Log.i("INFOTAG", "-----theme:" + listApplications.get(position).theme);
Log.i("INFOTAG", "-----uiOptions:" + listApplications.get(position).uiOptions);
Log.i("INFOTAG", "");
return convertView;
}

class ViewHolder {
ImageView	logo;
ImageView	icon;
TextView	packageName;
TextView	labelName;
}

}

}