Question

package com.App.Detect;

 import android.app.Activity;
 import android.content.pm.PackageManager;
 import android.os.Bundle;
 import android.widget.*;

  public class MainActivity extends Activity
 {
    TextView t;
    @Override
    protected void onCreate(Bundle  savedInstanceState)
   {
        t =  (TextView)findViewById(R.id.TextView);
       super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
       //Put the package name here...
       boolean installed = isAppInstalled("com.my.detect.prokey");
       if (installed)
       {
        t.setText("App already installed on your android");
       }
       else
       {
           t.setText("Sorry,App is not installed on your android");
      }
   }

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

我正在尝试创建一个专业密钥来禁用广告并启用高级功能。

我搜索并发现此代码将“systemoutprintin”修改为t（textview）但应用程序立即崩溃我该怎么办？

Answer 1

通过checkSignatures方法很简单：

PackageManager manager = getPackageManager();
    if (manager.checkSignatures("<your_main_package_name>",
            "<your_pro_key_package_name>") == PackageManager.SIGNATURE_MATCH) {
        //act here(if the signatures of the two packages matches)
    }

这将检查两者，即两个应用的签名匹配，就像安装了专业密钥一样。

方法checkSignatures：

true如果安装了专业密钥且签名匹配
false如果未安装专业版
false如果安装了专业密钥且签名不匹配

只有在apks与same key

以下是完整的代码：

package com.App.Detect;

import android.app.Activity;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.*;

public class MainActivity extends Activity {
    TextView t;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        t = (TextView) findViewById(R.id.TextView);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        PackageManager manager = getPackageManager();
        if (manager.checkSignatures("<your_main_package_name>",
            "<your_pro_key_package_name>") == PackageManager.SIGNATURE_MATCH) {
            //act here(if the signatures of the two packages matches)
        } else {
            //act here(if the signatures of the two packages won't match or pro key isn't installed at all)
        }

    }
}

希望这有帮助！

Answer 2

要检查所需的应用程序已经安装，请参考以下内容：

private boolean isPackageInstalled(String packagename, Context context) {
    PackageManager pm = context.getPackageManager();
    try {
        pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
        return true;
    } catch (NameNotFoundException e) {
        return false;
    }
}

应用程序在检测到应用时崩溃了

2 个答案: