Android获取本机安装程序列表

效果图

初使化

在使用SimpleAdapter绑定数据时，如果ImageView控件的数据来源是Drawable则显示失败，因为默认图片显示控件绑定的是id值

public class DesktopActivity extends BaseActivity implements AdapterView.OnItemClickListener

private List<Map<String, Object>> lstData; //储存应用名和图标
private List<String> lstPackage; //储存应用包名，与应用名进行对应
private SimpleAdapter simpleAdapter;

取得系统应用数据

private void getData() {
    
    
    List<PackageInfo> packageInfoList = getPackageManager().getInstalledPackages(0);
    for (int p = 0; p < packageInfoList.size(); p++) {
    
    
        PackageInfo packageInfo = packageInfoList.get(p);
        //取得用户安装应用，else则为系统应用
        if ((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
    
    
            Map<String, Object> map = new HashMap<String, Object>(); 
            //应用程序图标
            map.put("image", packageInfo.applicationInfo.loadIcon(getPackageManager())); 
            //应用程序显示名称
            map.put("label", packageInfo.applicationInfo.loadLabel(getPackageManager()).toString());
            lstData.add(map);
            //应用程序包名
            lstPackage.add(packageInfo.packageName);
        }
    }
}

初使化 Adapter

由于取得的系统用户安装应用数据中，应用图标为 drawable 类型，无法直接使用 SimpleAdapter 直接赋值，需要更改数据绑定方法

lstData = new ArrayList<Map<String, Object>>();
getData();
simpleAdapter = new SimpleAdapter(this, lstData, R.layout.widget_desktop_item, new String[]{
    
    "image", "label"}, new int[]{
    
    R.id.iv_widget_desktop_icon, R.id.tv_widget_desktop_label});
//重写数据绑定方式
simpleAdapter.setViewBinder(new SimpleAdapter.ViewBinder() {
    
    
    @Override
    public boolean setViewValue(View view, Object o, String s) {
    
    
        if(view instanceof ImageView && o instanceof Drawable){
    
    
            ImageView iv = (ImageView)view;
            iv.setImageDrawable((Drawable)o);
            //调整图片大小
			//RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(ViewGroup.MarginLayoutParams.MATCH_PARENT, ViewGroup.MarginLayoutParams.MATCH_PARENT);
			//layoutParams.width = Integer.parseInt(viewBinding.etDesktopIconsize.getText().toString().trim());
			//layoutParams.height = Integer.parseInt(viewBinding.etDesktopIconsize.getText().toString().trim());
			//iv.setLayoutParams(layoutParams);
            return true;
        }else {
    
    
            return false;
        }
    }
});

viewBinding.gvDesktopAppGroup.setAdapter(simpleAdapter);

绑定事件

应用程序显示出来后，我们还要实现他点击之后能够打开相应的应用
系统应用有些属于无界面服务类的，所以，可能点击之后没反应

viewBinding.gvDesktopAppGroup.setOnItemClickListener(this);

@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
    
    
    switch (adapterView.getId()) {
    
    
        case R.id.gv_desktop_app_group:
            //根据应用的 package 包名启动外部应用程序
            Intent intent = getPackageManager().getLaunchIntentForPackage(lstPackage.get(i));
            if (intent != null) {
    
    
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(intent);
            }
            break;
    }
}