如何查看 android 設備中是否安裝了 Whatsapp？

Question

我想檢查 whatsapp 是否安裝在移動設備中，如果安裝則顯示 toast“已安裝”，如果未安裝則顯示 Toast“未安裝”。我該怎么做請幫忙。

Answer 1

您可以使用此代碼。 它將檢查是否安裝了軟件包。

public class Example extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //Put the package name here...
        boolean installed = appInstalledOrNot("com.whatsapp");  
        if(installed) {
            System.out.println("App is already installed on your phone");         
        } else {
            System.out.println("App is not currently installed on your phone");
        }
    }

    private boolean isAppInstalled(String packageName) {
        PackageManager pm = getPackageManager();
        boolean app_installed;
        try {
            pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
            app_installed = true;
        }
        catch (PackageManager.NameNotFoundException e) {
            app_installed = false;
        }
        return app_installed;
    }
}

Answer 2

這是獲取設備中已安裝應用程序的所有包名的代碼

 final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
    mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
    final List pkgAppsList = context.getPackageManager().queryIntentActivities( mainIntent, 0);

獲得軟件包列表后搜索com.whatsapp（最新的包名的應用程序在官方網站給出的WhatsApp ）。 就是這樣..

Answer 3

試試這個。

在這里，您需要將包名稱作為 uri 傳遞。

private boolean appInstalledOrNot(String uri) {
        PackageManager pm = getPackageManager();
        boolean app_installed;
        try {
            pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
            app_installed = true;
        }
        catch (PackageManager.NameNotFoundException e) {
            app_installed = false;
        }
        return app_installed;
    }

像這樣檢查條件。

if(!appInstalledOrNot("com.whatsapp")){
    // Toast message not installed.
}else{
    // Toast message installed.
}

Answer 4

像這樣嘗試：

public class WhatsApp_Check extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);        
        boolean installed = appInstalledOrNot("whatsapp_package_name");  
        if(installed) {
          //print whatsApp is already installed on your phone
            else{
           // print whatsApp is not currently installed on your phone
        }
    }

    private boolean appInstalledOrNot(String uri) {
        PackageManager pm = getPackageManager();
        boolean app_installed;
        try {
            pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
            app_installed = true;
        }
        catch (PackageManager.NameNotFoundException e) {
            app_installed = false;
        }
        return app_installed;
    }
}

Answer 5

試試這個方法：

private void checkWhatsapp() {
    String packageName = "com.whatsapp";
    String mesgToShare = "Hey, I am searching for Whatsapp in your device.";

    boolean gotPackage = false;
    Intent shareIntent = new Intent( android.content.Intent.ACTION_SEND );
    shareIntent.setType( "text/plain" );
    shareIntent.putExtra( android.content.Intent.EXTRA_TEXT, mesgToShare );
    List<ResolveInfo> activityList = getPackageManager().queryIntentActivities( shareIntent, 0 );
    for ( final ResolveInfo app : activityList ) {
        if ( (app.activityInfo.name).contains( packageName ) ) {
            gotPackage = true;
            final ActivityInfo activity = app.activityInfo;
            ComponentName name = new ComponentName( activity.applicationInfo.packageName, activity.name );
            shareIntent.addCategory( Intent.CATEGORY_LAUNCHER );
            shareIntent.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED );
            shareIntent.setComponent( name );
            startActivity( shareIntent );
            break; // We already found what we were looking for. Don't need to execute the rest of the Loop
        }
    }

    if ( !gotPackage )
        Log.e("TAG", "Whatsapp is not installed in your device");
}

Answer 6

基於@eliasz-kubala 的回答，這將在 Android 11 上為我工作，只需將其添加到 Manifest

  <manifest 
    ...> 
    <queries> <package android:name="com.whatsapp" /> </queries>
  
    <application ....>
    </application>
  </manifest>

然后使用這個 Kotlin 函數

  private fun isAppInstalled(packageName: String): Boolean {
    val pm: PackageManager = getPackageManager()
    return try {
        pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES)
        true
    } catch (e: PackageManager.NameNotFoundException) {
        false
    }
   }

Answer 7

        if (isAppInstalled("com.whatsapp")) {
            val sendIntent = Intent("android.intent.action.MAIN")
            sendIntent.component = ComponentName("com.whatsapp", "com.whatsapp.Conversation")
            sendIntent.putExtra(
                "jid",
                PhoneNumberUtils.stripSeparators("918219243720").toString() + "@s.whatsapp.net"
            )

            startActivity(sendIntent)

        } else {
            showToast("App is not currently installed on your phone")
        }

現在創建 fun()

private fun isAppInstalled(packageName: String): Boolean {
    return try {
        packageManager.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES)

        true
    } catch (ignored: PackageManager.NameNotFoundException) {
        false
    }
}

現在在清單文件中添加相同的行

<queries>
    <package android:name="com.whatsapp" />
    <package android:name="com.facebook.katana" />
</queries>