Android---获取已安装应用列表

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我们手机上安装的应用默认是以GridView的形式排放的，本篇博客将讲述以ListView的形式获得所有应用，并且点击应用后可以启动。

1.
ListView item的布局文件 list_item.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="48dp"  android:padding="5dip"   >     <ImageView      android:id="@+id/ivIcon"      android:layout_width="wrap_content"      android:layout_height="match_parent"      android:layout_marginRight="5dip"      android:scaleType="center"/>  <LinearLayout      android:orientation="vertical"      android:layout_width="0dip"      android:layout_height="match_parent"      android:layout_weight="1">         <TextView          android:id="@+id/tvName"          android:layout_width="match_parent"          android:layout_height="0dip"          android:layout_weight="1"          android:gravity="center_vertical"/>      <TextView          android:id="@+id/tvPack"          android:layout_width="match_parent"          android:layout_height="0dip"          android:layout_weight="1"          android:singleLine="true"          android:ellipsize="marquee"/>  </LinearLayout></LinearLayout>

2.主布局文件activity_main.xml

<?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="match_parent"    >    <ListView        android:id="@+id/lvApps"        android:layout_width="match_parent"        android:layout_height="wrap_content" /></LinearLayout>

3.ListView的适配器AppInfoAdapter.java

public class AppInfoAdapter extends BaseAdapter {    private Context mContext;    private List mListApp;    private LayoutInflater mLayoutInflater;    private PackageManager mPackageManager;    public AppInfoAdapter(Context mContext, List mListApp, PackageManager mPackageManager) {        this.mContext = mContext;        this.mListApp = mListApp;        this.mPackageManager = mPackageManager;        this.mLayoutInflater = LayoutInflater.from(mContext);    }    @Override    public int getCount() {        return mListApp.size();    }    @Override    public Object getItem(int position) {        return mListApp.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ApplicationInfo appInfo = (ApplicationInfo) mListApp.get(position);        ViewHolder holder = null;        if(convertView == null){            holder = new ViewHolder();            convertView = mLayoutInflater.inflate(R.layout.list_item, null);            holder.ivAppIcon = (ImageView) convertView.findViewById(R.id.ivIcon);            holder.tvAppName = (TextView) convertView.findViewById(R.id.tvName);            holder.tvPackageName = (TextView) convertView.findViewById(R.id.tvPack);            convertView.setTag(holder);        }else{            holder = (ViewHolder) convertView.getTag();        }        holder.ivAppIcon.setImageDrawable(appInfo.loadIcon(mPackageManager));        holder.tvAppName.setText(appInfo.loadLabel(mPackageManager));        holder.tvPackageName.setText(appInfo.packageName);        return convertView;    }    static class ViewHolder{        ImageView ivAppIcon;        TextView tvAppName;        TextView tvPackageName;    }}

4.工具类 Utils.java

public class Utils {    /**     * 获取已安装的应用     * @param context     * @return     */    public static List getInstalledApp(Context context){        return context.getPackageManager().getInstalledApplications(PackageManager.GET_META_DATA);    }    /**     * 根据包名,启动应用     * @param context     * @param pm     * @param packageName     * @return     */    public static boolean launchApp(Context context,PackageManager pm,String packageName){        Intent intent = pm.getLaunchIntentForPackage(packageName);        if(intent != null){            try {                context.startActivity(intent);                return true;            } catch (ActivityNotFoundException e) {                Toast.makeText(context, "Applicatin not found", Toast.LENGTH_SHORT).show();                e.printStackTrace();            }        }        return false;    }}

5.MainActivity.java

public class MainActivity extends Activity {    private ListView mListView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mListView = (ListView) findViewById(R.id.lvApps);        AppInfoAdapter adapter = new AppInfoAdapter(this, Utils.getInstalledApp(this), getPackageManager());        mListView.setAdapter(adapter);        mListView.setOnItemClickListener(new OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view,                    int position, long id) {                ApplicationInfo info = (ApplicationInfo) parent.getItemAtPosition(position);                Utils.launchApp(parent.getContext(), getPackageManager(), info.packageName);            }        });    }}

运行截图：

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