導致：java.lang.SecurityException：權限拒絕：}與撤銷權限android.permission.CAMERA

Question

我想製作一個應用程序，我想使用媒體API，然後打開相機並使用拍照並顯示在

MainActivity.java

package com.example.hsports.cameraapiuse; 

import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.pm.PackageInfo; 
import android.content.pm.PackageManager; 
import android.graphics.Bitmap; 
import android.os.Build; 
import android.provider.MediaStore; 
import android.support.v4.app.ActivityCompat; 
import android.support.v4.content.ContextCompat; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.TextView; 
import android.widget.Toast; 

import org.w3c.dom.Text; 

import java.util.jar.Manifest; 

public class MainActivity extends AppCompatActivity { 

    static final int REQUEST_IMAGE_CAPTURE = 1; 
    static final int MY_PERMISSIONS_REQUEST_CAMERA=2; 

    ImageView mImageView; 

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

     mImageView=(ImageView)findViewById(R.id.mImageView); 
    } 


    public void dispatchTakePictureIntent() { 

     Intent takepicture=new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     if(takepicture.resolveActivity(getPackageManager())!=null) { 
      startActivityForResult(takepicture, REQUEST_IMAGE_CAPTURE); 
     } 
    } 


    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) { 
      Bundle extras = data.getExtras(); 
      Bitmap imageBitmap = (Bitmap) extras.get("data"); 
      mImageView.setImageBitmap(imageBitmap); 
     } 
    } 


    public void checkPermission(View view) 
    { 
     int permissionCheck=ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA); 

    } 

    public void grantPermission(View view) 
    { 
     if(ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA)!=PackageManager.PERMISSION_GRANTED) 
     { 

     } 
     else 
     { 
      ActivityCompat.requestPermissions(this, new String[] {android.Manifest.permission.CAMERA},MY_PERMISSIONS_REQUEST_CAMERA); 

     } 
    } 

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

     switch(requestCode) 
     { 
      case MY_PERMISSIONS_REQUEST_CAMERA: 
       if (grantResults.length > 0 
         && grantResults[0] == PackageManager.PERMISSION_GRANTED) { 

        dispatchTakePictureIntent(); 
       } else { 


       } 
       return; 
     } 
    } 
} 

activity_main.xml中的光（在這裏我已經加入一個TextView和查看將要採取的照相機圖像的ImageView的）

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:orientation="vertical" 
    tools:context="com.example.hsports.cameraapiuse.MainActivity"> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Hello World!" 
     android:id="@+id/permission" 
     /> 

    <ImageView 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/mImageView" 
     /> 


    <Button 
     android:id="@+id/check_permission" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:text="Check Permission" 
     android:onClick="checkPermission" 
     /> 

    <Button 
     android:id="@+id/request_permission"  
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:text="Request Permission" 
     android:onClick="grantPermission"  
     />    

</LinearLayout> 

Android_manifest.xml（在這裏我已經指定了某些應用的權限爲使用相機的硬件。）

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.hsports.cameraapiuse"> 

    <uses-permission 
     android:name="android.permission.CAMERA" 
     android:required="true" 
     /> 

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

執行此代碼，我沒有得到任何相機後點擊打開後「申請許可「按鈕。 我想讓相機打開並點擊一張照片並顯示在imageView中。

Answer 1

根據您運行的android版本（例如棉花糖），您可能需要檢查運行時間的執行情況。

檢查以下顯示相機示例的鏈接。

https://developer.android.com/training/permissions/requesting.html