获取系统已安装应用列表

package com.studio.listviewproject.listview;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.studio.listviewproject.R;

import java.util.List;

public class AppListActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_app_list);

ListView appListView = (ListView) findViewById(R.id.app_list_view);

LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

View headerView = layoutInflater.inflate(R.layout.header_list_view, null);
appListView.addHeaderView(headerView);

final List<ResolveInfo> appInfos = getAppInfos();
appListView.setAdapter(new AppListAdapter(appInfos));

appListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String packageName = appInfos.get(i).activityInfo.packageName;

String className = appInfos.get(i).activityInfo.name;

ComponentName componentName = new ComponentName(packageName, className);

final Intent intent = new Intent();
intent.setComponent(componentName);
startActivity(intent);
}
});

}

/**
* 获取所有的应用信息
*
* @return
*/
private List<ResolveInfo> getAppInfos() {
Intent intent = new Intent(Inten
4000
t.ACTION_MAIN, null);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
return getPackageManager().queryIntentActivities(intent, 0);
}

public class AppListAdapter extends BaseAdapter {

//这就是要填充的数据列表
List<ResolveInfo> mAPPInfos;

public AppListAdapter(List<ResolveInfo> appNames) {
mAPPInfos = appNames;
}

@Override
public int getCount() {
//有多少条数据
return mAPPInfos.size();
}

@Override
public Object getItem(int i) {
//返回当前i位置的这一条
return mAPPInfos.get(i);
}

@Override
public long getItemId(int i) {
//返回当前i位置的这一条的ID
return i;
}

@Override
public View getView(final int i, View view, ViewGroup viewGroup) {
//处理 view -- data 填充数据的一个过程

LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.item_app_list_view, null);

ImageView appIconImageView = view.findViewById(R.id.app_icon_image_view);
TextView appNameTextView = view.findViewById(R.id.app_name_text_view);

appNameTextView.setText(mAPPInfos.get(i).activityInfo.loadLabel(getPackageManager()));
appIconImageView.setImageDrawable(mAPPInfos.get(i).activityInfo.loadIcon(getPackageManager()));
return view;
}
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="80dp">

<ImageView
android:layout_width="match_parent"
android:layout_height="80dp"
android:background="@drawable/pic"/>
</LinearLayout>

<?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="vertical">

<ListView
android:id="@+id/app_list_view"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>

</LinearLayout>

<?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/app_icon_image_view"
android:layout_width="60dp"
android:layout_height="60dp"
android:src="@mipmap/ic_launcher" />

<TextView
android:id="@+id/app_name_text_view"
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
android:paddingLeft="6dp"
android:text="@string/app_name"
android:textSize="20sp" />
</LinearLayout>