Question

您好我一直在创建一个使用谷歌地图的应用程序，一切正常，直到我了解到Marshmallow需要权限。我一直在阅读它，当我点击这样的按钮时，我已经开始工作了它会崩溃应用程序。

  @Override
public void onClick(View v) {
    view = v;
    int id = v.getId();
    switch (id){
        case R.id.check_permission:
            if (checkPermission()) {
                Snackbar.make(view,"Permission already granted.",Snackbar.LENGTH_LONG).show();
            } else {
                Snackbar.make(view,"Please request permission.",Snackbar.LENGTH_LONG).show();
                requestPermission();
            }
            break;
    }

但是，当我尝试在启动活动时请求GPS权限的函数，如此

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

   checkPermission();
}

private boolean checkPermission(){
    int result = ContextCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION);
    if (result == PackageManager.PERMISSION_GRANTED){
        return true;
    } else {
        requestPermission();
        return false;
    }
}

private void requestPermission(){
    if (ActivityCompat.shouldShowRequestPermissionRationale(activity,Manifest.permission.ACCESS_FINE_LOCATION)){
        Toast.makeText(context,"GPS permission allows us to access location data. Please allow in App Settings for additional functionality.",Toast.LENGTH_LONG).show();
    } else {
        ActivityCompat.requestPermissions(activity,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},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) {
                Snackbar.make(view,"Permission Granted, Now you can access location data.",Snackbar.LENGTH_LONG).show();
            } else {

                Snackbar.make(view,"Permission Denied, You cannot access location data.",Snackbar.LENGTH_LONG).show();
            }
            break;
    }
}

这是我的LogCat：

E/AndroidRuntime: FATAL EXCEPTION: main
              Process: com.example.gin.runtimepermissions, PID: 9203
              java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=1, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.example.gin.runtimepermissions/com.example.gin.runtimepermissions.MainActivity}: java.lang.IllegalArgumentException: No suitable parent found from the given view. Please provide a valid view.
                  at android.app.ActivityThread.deliverResults(ActivityThread.java:3699)
                  at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
                  at android.app.ActivityThread.-wrap16(ActivityThread.java)
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
                  at android.os.Handler.dispatchMessage(Handler.java:102)
                  at android.os.Looper.loop(Looper.java:148)
                  at android.app.ActivityThread.main(ActivityThread.java:5417)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
               Caused by: java.lang.IllegalArgumentException: No suitable parent found from the given view. Please provide a valid view.
                  at android.support.design.widget.Snackbar.make(Snackbar.java:137)
                  at com.example.gin.runtimepermissions.MainActivity.onRequestPermissionsResult(MainActivity.java:66)
                  at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:6553)
                  at android.app.Activity.dispatchActivityResult(Activity.java:6432)
                  at android.app.ActivityThread.deliverResults(ActivityThread.java:3695)
                  at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742) 
                  at android.app.ActivityThread.-wrap16(ActivityThread.java) 
                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393) 
                  at android.os.Handler.dispatchMessage(Handler.java:102) 
                  at android.os.Looper.loop(Looper.java:148) 
                  at android.app.ActivityThread.main(ActivityThread.java:5417) 
                  at java.lang.reflect.Method.invoke(Native Method) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

任何人都可以解释为什么会崩溃？提前致谢：D

Answer 1

Caused by: java.lang.IllegalArgumentException: No suitable parent found from the given view. Please provide a valid view.

据推测，这是来自您的两个Snackbar引用之一：

Snackbar.make(view,"Permission Granted, Now you can access location data.",Snackbar.LENGTH_LONG).show();

在两者中，您都会引用view字段。我不知道你在哪个地方填充这个领域。您需要从布局中指定view有效View，通常通过findViewById()获取。

或者，正如您显然所做的那样，将Snackbar替换为其他内容（例如Toast）。

Answer 2

        String [] permissions=new String[]{
                Manifest.permission.READ_EXTERNAL_STORAGE,
                Manifest.permission.WRITE_EXTERNAL_STORAGE,
                Manifest.permission.ACCESS_FINE_LOCATION
        };
        List<String> listPermissionsNeeded = new ArrayList<>();
        for (String permission:permissions) {
            if (ContextCompat.checkSelfPermission(this,permission )!= PackageManager.PERMISSION_GRANTED){
                listPermissionsNeeded.add(permission);
            }
        }
        if (!listPermissionsNeeded.isEmpty()) {
            ActivityCompat.requestPermissions(this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]), 1);
        }

Answer 3

您可以使用XML布局查看小吃店。当小吃店没有查看其视图的观点时会发生此问题。所以我们应该告诉它在这个布局中查看你的。它可以是任何布局。例如，我使用线性布局。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorWhite"
android:gravity="center"
android:id="@+id/ll_container"
android:orientation="vertical">

使用线性布局的ID并告诉小吃店如下所示查看

LinearLayout mLinearLayoutContainer = v.findViewById(R.id.ll_container)

Snackbar snackbar = Snackbar
                    .make(mLinearLayoutContainer, "your text here.", Snackbar.LENGTH_LONG)
                    .setActionTextColor(getResources().getColor(R.color.colorWhite))
                    .setAction(getResources().getString(R.string.label_settings), new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                            Intent myIntent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
                            startActivity(myIntent);
                        }
                    });

            View sbView = snackbar.getView();
            snackbar.show();

Answer 4

Snackbar.make(view,"Permission Granted, Now you can access location data.",Snackbar.LENGTH_LONG).show();

而不是使用下面的那个尝试

 Snackbar.make(findViewById(R.id.container_view),"Permission Granted, Now you can access location data.",Snackbar.LENGTH_LONG).show();

它对我有用。

棉花糖运行时权限崩溃的应用程序

4 个答案: