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java - 每当我第一次启动应用程序时，应用程序崩溃，然后它会询问我用户权限

问题描述

我的 Android 应用程序在第一次启动时崩溃，它询问我有关用户呼叫权限的信息。当我再次启动我的应用程序时，它可以正常工作。我已经尝试了以下代码。

public void loadContactList() {

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
        requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, PERMISSIONS_REQUEST_READ_CONTACTS);
    } else {.....}
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions,int[] grantResults) {
    if (requestCode == PERMISSIONS_REQUEST_READ_CONTACTS) {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            loadContactList();
        } else {
            Toast.makeText(this, "Until you grant the permission, we canot display the list", Toast.LENGTH_SHORT).show();
        }
    }
}

标签： javaandroidpermissionscall

解决方案

您的代码是正确的，但是您将代码设置在错误的位置让我们试试这个它肯定会对您有所帮助....

In Your Main Activity...

private int STORAGE_PERMISSION_CODE = 1;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if (ContextCompat.checkSelfPermission(MainActivity.this,
            Manifest.permission.WRITE_EXTERNAL_STORAGE) == 
  PackageManager.PERMISSION_GRANTED) {
        filter();
        Toast.makeText(this, ""+arrayList, Toast.LENGTH_SHORT).show();
    } else {
        Permission.requestStoragePermission(MainActivity.this,
                  STORAGE_PERMISSION_CODE);
    }

}//on create closed

许可方式......

//---------------------------------RuntimePermission-----------------------------//
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] 
    permissions, @NonNull int[] grantResults) {
    if (requestCode == STORAGE_PERMISSION_CODE)  {
        if (grantResults.length > 0 && grantResults[0] == 
     PackageManager.PERMISSION_GRANTED) {
            filter();
        } else {
            Toast.makeText(this, "Permission DENIED", Toast.LENGTH_SHORT).show();

Permission.requestStoragePermission(MainActivity.this,STORAGE_PERMISSION_CODE);
        }
    }
}

之后制作java类以获得许可....

public class Permission {
public static void requestStoragePermission(final Activity activity, final int 
       STORAGE_PERMISSION_CODE) {
    if (ActivityCompat.shouldShowRequestPermissionRationale(activity,
            Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
        new AlertDialog.Builder(activity)
                .setTitle("Permission needed")
                .setMessage("This permission is needed because of this and that")
                .setPositiveButton("ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ActivityCompat.requestPermissions(activity,
                                new String[] 
        {Manifest.permission.WRITE_EXTERNAL_STORAGE}, STORAGE_PERMISSION_CODE);
                    }
                })
                .setNegativeButton("cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                })
                .create().show();
    } else {
        ActivityCompat.requestPermissions(activity,
                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 
   STORAGE_PERMISSION_CODE);
    }
}

}

您必须记住的主要事情是将您的工作方法放在正确的位置，例如我的 is filter();

它对你有用，因为当我陷入同样的​​境地时它对我有用

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