读取所有的android应用显示在Item中，按键有响应-优快云博客

本文介绍了一个安卓应用管理器的实现方法，该应用可以读取设备上所有已安装的应用，并显示其图标和名称。同时，还提供了按名称排序的功能，并允许用户通过点击启动应用。此外，对于非系统应用，该管理器还能获取并展示应用请求的所有权限。

1. 读取所有的应用

2. 显示所有的应用

3. 获取安装应用的权限列表

public class MainActivity extends Activity implements OnItemClickListener {

	private GridView mGridView; 
	private Context mContext; 
	private PackageManager mPackageManager; 
	private List<ResolveInfo> mAllApps; 
	List<String> packagelist=new ArrayList<String>();
	List<String> systemApp=new ArrayList<String>();
	HashMap<String, String[]> map=new HashMap<String, String[]>();
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		setupViews(); 
	}
	
	public void setupViews(){
		mContext = MainActivity.this;
		mGridView = (GridView)findViewById(R.id.allapps);  //用以显示读取到的应用
		mPackageManager = getPackageManager();  //包管理器 
		 
		Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); 
		mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
		
		mAllApps = mPackageManager.queryIntentActivities(mainIntent, 0);  //得到所有的APP 
		Collections.sort(mAllApps, new ResolveInfo.DisplayNameComparator(mPackageManager));  //排序	
		
		mGridView.setAdapter(new GridItemAdapter(mContext, mAllApps));  //显示设置
		mGridView.setNumColumns(3);  //显示列数
		mGridView.setOnItemClickListener(this);  //设置Click监听 
	}
	
	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
		ResolveInfo res = mAllApps.get(position); 
		String pkg = res.activityInfo.packageName; 
		String cls = res.activityInfo.name; 
		ComponentName componet = new ComponentName(pkg, cls); 
		Intent i = new Intent(); 
		i.setComponent(componet); 
		startActivity(i); 
	}
	
	private class GridItemAdapter extends BaseAdapter{ 
		private Context context;
		private List<ResolveInfo> resInfo; 
		
		public GridItemAdapter(Context c,List<ResolveInfo> res){ 
			context = c;  
			resInfo = res; 
		}
		
		public int getCount() { 
			return resInfo.size(); 
		}
		
		public Object getItem(int position) { 
			return null; 
		}
		
		public long getItemId(int position) { 
			return 0;  
		}
		
		public View getView(int position, View convertView, ViewGroup parent) { 
			convertView = LayoutInflater.from(context).inflate(R.layout.application_layout, null); 
			ImageView app_icon = (ImageView)convertView.findViewById(R.id.app_icon);
			TextView app_tilte = (TextView)convertView.findViewById(R.id.app_title);
			
			ResolveInfo res = resInfo.get(position); 
			app_icon.setImageDrawable(res.loadIcon(mPackageManager)); 
			app_tilte.setText(res.loadLabel(mPackageManager).toString());
			
			if((res.activityInfo.applicationInfo.flags&ApplicationInfo.FLAG_SYSTEM)<=0){
				String packagename=res.loadLabel(mPackageManager).toString(); 
				String[] permission;
				try {
					//获取已安装应用的权限
					permission = mPackageManager.getPackageInfo(res.activityInfo.packageName, PackageManager.GET_PERMISSIONS).requestedPermissions;
					packagelist.add(packagename);
					map.put(packagename, permission);
				}catch (NameNotFoundException e) {
					e.printStackTrace();
				}
			}
			return convertView;
		}
	}
}