Android运行时权限不断被拒绝

Question

我正在尝试为我的Android应用程序请求运行时权限。这是我的代码：

private static final int PERMISSION_REQUEST_CODE = 1;
String installPermission = Manifest.permission.INSTALL_PACKAGES;
String writePermission = Manifest.permission.WRITE_EXTERNAL_STORAGE;

@Click(R.id.buttonVersionUpgrade)
void buttonVersionUpgradeClicked(View v) {
    if (!checkPermission(installPermission)) {
        requestPermission(installPermission);
    }
    if (!checkPermission(writePermission)) {
        requestPermission(writePermission);
    }
}

private boolean checkPermission(String permission){
    if (Build.VERSION.SDK_INT >= 23) {
        int result = ContextCompat.checkSelfPermission(getApplicationContext(), permission);
        if (result == PackageManager.PERMISSION_GRANTED){
            return true;
        } else {
            return false;
        }
    } else {
        return true;
    }
}

private void requestPermission(String permission){
    if (ActivityCompat.shouldShowRequestPermissionRationale(this, permission)){
        Toast.makeText(getApplicationContext(), "Permission required for features to work.",Toast.LENGTH_LONG).show();
    }
    ActivityCompat.requestPermissions(this, new String[]{permission},PERMISSION_REQUEST_CODE);
}

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case PERMISSION_REQUEST_CODE:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(getApplicationContext(), "Permission Granted.",
                        Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(getApplicationContext(),"Permission Denied.",
                        Toast.LENGTH_LONG).show();
            }
            break;
    }
}

在我的AndroidManifest中。xml：

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

但是，上面的代码始终显示权限被拒绝，而不提示用户请求权限。有什么想法吗？

谢谢

Answer 1

首先，if（Build.VERSION.SDK\u INT

但是，上面的代码始终显示权限被拒绝，而不提示用户请求权限。

这是因为，android.permission.INSTALL_PACKAGES

如果您只请求android.permission.WRITE_EXTERNAL_STORAGE，那么您应该会看到正确的权限对话框。

权限请求显示为保护级别为危险的权限。您可以参考此文档来确定保护级别。有关权限级别和类型的更多详细信息，请参阅此权限概述文档

Answer 2

我有一个清单错误：

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

“WRITE\u EXTERNAL\u STORAGE”（写入外部存储）之后有空格。我把它删除了，现在一切都好了。