如何以编程方式检查 Android 中是否安装了应用程序?

How to check programmatically if an application is installed or not in Android?(如何以编程方式检查 Android 中是否安装了应用程序?)

问题描述

我们以编程方式安装了应用程序.

We have installed applications programmatically.

1. 如果应用程序已安装在设备中，则应用程序会自动打开.
2. 否则安装特定的应用程序.

引导我.我不知道.谢谢.

Guide Me. I have no idea. Thanks.

推荐答案

试试这个:

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Add respective layout
        setContentView(R.layout.main_activity);

        // Use package name which we want to check
        boolean isAppInstalled = appInstalledOrNot("com.check.application");  
        
        if(isAppInstalled) {
            //This intent will help you to launch if the package is already installed
            Intent LaunchIntent = getPackageManager()
                .getLaunchIntentForPackage("com.check.application");
            startActivity(LaunchIntent);
                    
            Log.i("SampleLog", "Application is already installed.");          
        } else {
            // Do whatever we want to do if application not installed
            // For example, Redirect to play store

            Log.i("SampleLog", "Application is not currently installed.");
        }
    }

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

        return false;
    }

}

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