Question

最近，我用android 7.0和upper更新了一个项目。我想出了提供商的问题。

当我拍照并使用onActivityForResult来调整图像大小或显示它时。我发现数据为空。我想知道为什么？我已经尝试了几种方法来获得Uri。

但数据为空。

 //A button click to call this.
        Uri tempUri;
        private void takePhoto() {
            if (isSdcardExisting()) {
                //create a file.
                File file = new File(getExternalFilesAbsolutePath(this),HERO_IMAGE);
                if(file.exists()){
                    try {
                        file.delete();
                        file.createNewFile();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                //use a class to deal uri problem android 7.0 problem.
                Uri uri = FileProvider7.getUriForFile(this,file);
                Intent cameraIntent = new Intent("android.media.action.IMAGE_CAPTURE");
                //put some keys to intent 
                cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
                cameraIntent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
                /*
                 * grant uri
                 * 
                 * the temp sulution : 
                 * tempUri = uri;
                 */
                FileProvider7.grantUriPermission(this,cameraIntent,uri);
                startActivityForResult(cameraIntent, CODE_TAKE_PHOTO);
            } else {
                Toast.makeText(this, "请插入SD卡", Toast.LENGTH_LONG)
                        .show();
            }

        }

        @Override
        protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
            if(resultCode != RESULT_OK){
                return;
            }else{
                switch (requestCode){
                    case CODE_TAKE_PHOTO:
                        /**
                         * the requestCode and resultCode is right,but the data is null
                         * I wander how to use this.
                         * 
                         * the temp solution is to define a Uri obejct to store the uri.
                         * 
                         * if(tempUri != null)
                         *      resize(tempUri);
                         */
                        Log.d(TAG, "onActivityResult: data ---> " + data);
                        if(data != null){
                            Bundle bundle = data.getExtras();
                            Log.d(TAG, "onActivityResult: bundle ---> " + bundle);
                            if(bundle != null){
                                Uri resizeUri = bundle.getParcelable(MediaStore.EXTRA_OUTPUT);
                                Log.d(TAG, "onActivityResult: resizeUri ---> " + resizeUri);
                                String imageType = bundle.getString("outputFormat");
                                Log.d(TAG, "onActivityResult: imageType ---> " + imageType);
                                Uri uri = data.getData();
                                Log.d(TAG, "onActivityResult: getData --->  " + uri);
                                resize(resizeUri);
                            }
                        }
                        break;

                    case CODE_SHOW_IMAGE:
                        break;
                }
            }
            super.onActivityResult(requestCode, resultCode, data);
        }

我找到了一个解决方案，活动需要在清单活动意图过滤器中添加操作。但它似乎不起作用。

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.rambopan.demotryusercamera">

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

    <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">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <action android:name="com.android.camera.action.CROP"/>
                <action android:name="android.media.action.IMAGE_CAPTURE"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}.FileProvider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
        </provider>

    </application>

</manifest>

日志。如果没有，则数据为空。（Android 5.0）

06-12 15:26:11.063 368-368/com.rambopan.demotryusercamera D/XADAX.FileProvider7: getUriForFile: ---> file:///storage/emulated/0/Android/data/com.rambopan.demotryusercamera/files/hero
06-12 15:26:32.624 368-368/com.rambopan.demotryusercamera D/XADAX.MainActivity: onActivityResult: data ---> null

Answer 1

您可以从cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri);

中发送的

#include <stdio.h>
#include<iostream>
using namespace std;
int main()
{
    int n, i;
    vector<double> nums;
    double sum = 0.0, average;

    cout<<"Enter the numbers of elements: ";
    cin>>n;


    for(i = 0; i < n; ++i)
    {
        cout<<"Enter number: "<<i+1;
        cin>>num[i];
        sum += num[i];
    }

    average = sum / n;
    cout<<"Average = "<<average

    return 0;
}

变量中获取图片

onActivityForResult数据为null

1 个答案: