Question

我使用以下代码获取已安装应用程序的列表并启动它们。它只打开计算器或时钟等应用程序。当我尝试打开联系人或摄像头等应用程序时，它不起作用，因为它们的启动活动为空。我如何打开这样的应用程序。

在下面的代码中，[5]指向相机。

       final PackageManager pm = getPackageManager();
    List<ApplicationInfo> packages = pm
        .getInstalledApplications(PackageManager.GET_META_DATA);


    for (ApplicationInfo packageInfo : packages) 
    {

        s[i]=packageInfo.packageName;
        i++;

        Log.d(TAG, "Installed package :" + packageInfo.packageName);
        Log.d(TAG,"Launch Activity :"+ pm.getLaunchIntentForPackage(packageInfo.packageName));

    }


}



    Intent mIntent = getPackageManager().getLaunchIntentForPackage(s[5]);


        try {
            startActivity(mIntent);

        } 
        catch (Exception err) {
            Toast t = Toast.makeText(getApplicationContext(),
                    "Not Found", Toast.LENGTH_SHORT);
            t.show();
        }

}

Answer 1

我终于能够解决问题。以下代码启动了所有应用程序。

PackageManager pm = this.getPackageManager（）;

    setContentView(R.layout.main);
    Intent mainIntent = new Intent(Intent.ACTION_MAIN, null); 
    mainIntent.addCategory(Intent.CATEGORY_LAUNCHER); 
    List<ResolveInfo> appList = pm.queryIntentActivities(mainIntent, 0); 
    Collections.sort(appList, new ResolveInfo.DisplayNameComparator(pm)); 

    TextView c=(TextView)findViewById(R.id.textView1);
    for(int i1=0; i1<appList.size(); i1++){ 
            c.setText(c.getText() + "\n" + 
                    "number: " + i1 + "\n" + 
                    "Name: " + appList.get(i1).loadLabel(pm) + "\n" 
                    ); 
    } 


    Intent i11 = new Intent(); 
    i11.setAction(Intent.ACTION_MAIN); 
    i11.addCategory(Intent.CATEGORY_LAUNCHER); 
    i11.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); 
    i11.setComponent(new ComponentName(appList.get (3).activityInfo.applicationInfo.packageName, appList.get(3).activityInfo.name)); 
    startActivity(i11);

使用启动活动null启动已安装的应用程

1 个答案: