How to install and uninstall a program on Android

For programmers, the Android mobile operating system is a very practical system. They can develop various Android applications to meet their own application needs. Here we will first explain the specific steps for installing and uninstalling Android programs.

In the source code of the Android installation and uninstallation program, we know:

 
 

  
  
< activity android:name=".PackageInstallerActivity">   
  
  
< intent-filter>   
  
  
< action android:name="android.intent.action.VIEW" />   
  
  
< category android:name="android.intent.category.DEFAULT" />   
  
  
< data android:scheme="content" />   
  
  
< data android:scheme="file" />   
  
  
< data android:mimeType="application/vnd.android.package-archive" />   
  
  
< /intent-filter>   
  
  
< /activity>   
  
  
< activity android:name=".UninstallerActivity">   
  
  
< intent-filter>   
  
  
< action android:name="android.intent.action.VIEW" />   
  
  
< action android:name="android.intent.action.DELETE" />   
  
  
< category android:name="android.intent.category.DEFAULT" />   
  
  
< data android:scheme="package" />   
  
  
< /intent-filter>   
  
  
< /activity> 
 
 

Because we can install a program from the SD card based on the permissions in it:

 
 

  
  
String fileName = Environment.getExternalStorageDirectory() 
+ "/myApp.apk";   
  
  
Intent intent = new Intent(Intent.ACTION_VIEW);   
  
  
intent.setDataAndType(Uri.fromFile(new File(fileName)), 
"application/vnd.android.package-archive");   
  
  
startActivity(intent);  
 
 

To uninstall a program;

 
 

  
  
Uri packageURI = Uri.parse("package:com.android.myapp");   
  
  
Intent uninstallIntent = new Intent
(Intent.ACTION_DELETE, packageURI);   
  
  
startActivity(uninstallIntent);  
 
 

The installation of non-market programs is not supported by default.

 
 

  
  
int result = Settings.Secure.getInt(getContentResolver(),
 Settings.Secure.INSTALL_NON_MARKET_APPS, 0);   
  
  
if (result == 0) {   
  
  
// show some dialog here   
  
  
// ...   
  
  
// and may be show application settings dialog manually   
  
  
Intent intent = new Intent();   
  
  
intent.setAction(Settings.ACTION_APPLICATION_SETTINGS);   
  
  
startActivity(intent);   
  
  
} 
 
 

The specific implementation method of Android installation and uninstallation is described here.