Question

我在项目中添加了READ_PHONE_STATE权限。

方案：我刚刚打开我的应用程序并获得权限警告“允许我的应用程序制作和管理电话？＆＃34; 现在我在后台移动我的应用程序，然后点击我的应用程序图标再次打开结果：“允许我的应用程序拨打和管理电话？＆＃34; 权限弹出窗口消失。

任何人都可以告诉这个行为吗？注意：我使用的是launchMode =＆＃34; singleInstance＆＃34;当使用launchMode =＆＃34;标准＆＃34;一切正常。

分享我的代码：

<?xml version="1.0" encoding="utf-8"?>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity" android:launchMode="singleTask">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

public class MainActivity extends AppCompatActivity {

public static final Integer REQUEST_CODE_FOR_PERMISSION = 0x1;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    askForPermission(this, Manifest.permission.READ_PHONE_STATE, REQUEST_CODE_FOR_PERMISSION);
}

public static void askForPermission(Activity context, String permission, Integer requestCode) {
    if ((Build.VERSION.SDK_INT >= 23) && (context != null) && (TextUtils.isEmpty(permission) == false)) {
        ActivityCompat.requestPermissions(context, new String[]{permission}, requestCode);
    }
}}

Answer 1

基于singleTask行为

如果活动的实例已经存在于单独的任务中，则系统通过调用其onNewIntent（）方法将意图路由到现有实例，而不是创建新实例。 < / p>

https://developer.android.com/guide/components/activities/tasks-and-back-stack#TaskLaunchModes

我能够通过处理

中的代码来解决此问题

onNewIntent（意图）

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    askForPermission(this, Manifest.permission.READ_PHONE_STATE, REQUEST_CODE_FOR_PERMISSION);
}

Answer 2

试试这个，

public class MainActivity extends AppCompatActivity {

    public static final Integer REQUEST_CODE_FOR_PERMISSION = 0x1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }

    @override
    private void onResume(){
    askForPermission(this, Manifest.permission.READ_PHONE_STATE, REQUEST_CODE_FOR_PERMISSION);
    }

    public static void askForPermission(Activity context, String permission, Integer requestCode) {
        if ((Build.VERSION.SDK_INT >= 23) && (context != null) && (TextUtils.isEmpty(permission) == false)) {
            ActivityCompat.requestPermissions(context, new String[]{permission}, requestCode);
        }
    }}

Answer 3

在finish()

中致电onBackPressed()

@Override
    public void onBackPressed() {
        super.onBackPressed();
        finish();
    }

这将再次启动活动，您的代码将在onCreate（）

中运行

Answer 4

使用像这样的运行时权限：

 public class MainActivity extends Activity {
        private static final int PERMISSION_REQUEST_CODE = 200;
        Context context;
        Activity activity;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            context = this;
            activity = this;
            setContentView(R.layout.activity_splash);
            if (!checkPermission()) {
                OpenActivity();
            } else {
                if (checkPermission()) {
                    requestPermissionAndContinue();
                } else {
                    OpenActivity();
                }
            }
        }

        private boolean checkPermission() {
            return ContextCompat.checkSelfPermission(this, READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED;
        }

        private void requestPermissionAndContinue() {
            if (ContextCompat.checkSelfPermission(this, READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {

                if (ActivityCompat.shouldShowRequestPermissionRationale(this, READ_PHONE_STATE)) {
                    AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this);
                    alertBuilder.setCancelable(true);
                    alertBuilder.setTitle("Permission necessary");
                    alertBuilder.setMessage("STORAGE permission is necessary to write event!!!");
                    alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                        @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
                        public void onClick(DialogInterface dialog, int which) {
                            ActivityCompat.requestPermissions(SplashActivityANother.this, new String[]{READ_PHONE_STATE,
                            }, PERMISSION_REQUEST_CODE);
                        }
                    });
                    AlertDialog alert = alertBuilder.create();
                    alert.show();
                    Log.e("", "permission denied, show dialog");
                } else {
                    ActivityCompat.requestPermissions(this, new String[]{READ_PHONE_STATE
                    }, PERMISSION_REQUEST_CODE);

                }
            } else {
                OpenActivity();

            }
        }

        @Override
        public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {

            if (requestCode == PERMISSION_REQUEST_CODE) {
                if (permissions.length > 0 && grantResults.length > 0) {

                    boolean flag = true;
                    for (int i = 0; i < grantResults.length; i++) {
                        if (grantResults[i] != PackageManager.PERMISSION_GRANTED) {
                            flag = false;
                        }
                    }
                    if (flag) {
                        OpenActivity();
                    } else {
                        finish();
                    }

                } else {
                    finish();
                }
            } else {
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            }
        }

        private void OpenActivity() {
            Intent i = new Intent(MainActivity.this, SecondActivity.class);
            startActivity(i);
        }
    }

并添加 <uses-permission android:name="android.permission.READ_PHONE_STATE" />进入menifist档案。

希望这有助于你

应用程序再次打开时，为什么权限对话框会消失？

4 个答案: