Question

我一直在努力弄清楚存储系统如何在Android上运行。现在我被困在请求WRITE_EXTERNAL_STORAGE的许可，我使用的是Android 7.1.1。这是我的代码：

int check = ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (check == PackageManager.PERMISSION_GRANTED) {
            //Do something
        } else {
            requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},1024);
        }

更新：所以代码确实有效，之前没有用，因为AndroidManifest.xml中有拼写错误，谢谢你的帮助！

Answer 1

试试这个，

private Context mContext=YourActivity.this;

private static final int REQUEST = 112;

if (Build.VERSION.SDK_INT >= 23) {
    String[] PERMISSIONS = {android.Manifest.permission.WRITE_EXTERNAL_STORAGE};
    if (!hasPermissions(mContext, PERMISSIONS)) {
        ActivityCompat.requestPermissions((Activity) mContext, PERMISSIONS, REQUEST );
    } else {
        //do here
    }
} else {
     //do here
}

获取权限结果

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode) {
        case REQUEST: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    //do here
            } else {
                Toast.makeText(mContext, "The app was not allowed to write in your storage", Toast.LENGTH_LONG).show();
            }
        }
    }
}

检查marshmallow的权限

private static boolean hasPermissions(Context context, String... permissions) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
        for (String permission : permissions) {
            if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
    }
    return true;
}

清单

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

如果您不想检查多个权限，请在PERMISSIONS数组中添加权限，如：

String[] PERMISSIONS = {android.Manifest.permission.WRITE_EXTERNAL_STORAGE,android.Manifest.permission.READ_EXTERNAL_STORAGE};

Answer 2

添加清单文件的权限

<manifest ...>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    ...
</manifest>

请求WRITE_EXTERNAL_STORAGE权限的正确方法

2 个答案: