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點擊startcamera2之后閃退

有大佬告知一下，謝謝

慕碼人8107772

2020-06-08

源自：Android攝像頭基礎 2-3

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2 回答

慕粉2357434992
2020-06-20

背景：

????在安卓7.0手機上，調用系統相機拍照，結果出現閃退。

原因：

????Android7.0中為了提高私有文件的安全性,禁止向你的應用外公開 file:// URI。如果一項包含文件 file:// URI類型的 Intent 離開你的應用，應用失敗，并出現 FileUriExposedException 異常。

解決方案：

FileProvider是Android 7.0出現的新特性，它是ContentProvider的子類，可以通過創建一個Content URI并賦予臨時的文件訪問權限來代替File URI實現文件共享。

修改以下三個文件：

AndroidMainfest.xml為：

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

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



????<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"?/>

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

????????????<intent-filter>
????????????????<action?android:name="android.media.action.IMAGE_CAPTURE"?/>

????????????????<category?android:name="android.intent.category.DEFAULT"?/>
????????????</intent-filter>
????????</activity>
　　　　<!--?android:name="android.support.v4.content.FileProvider"
?????　　-->
????????<provider
????????????android:authorities="com.example.androidcamera.fileprovider"
????????????android:name="androidx.core.content.FileProvider"
????????????android:grantUriPermissions="true"
????????????android:exported="false">
????????????<meta-data
????????????????android:name="android.support.FILE_PROVIDER_PATHS"
????????????android:resource="@xml/filepaths"/>
????????</provider>
????</application>

</manifest>

在res--->增加xml文件夾---->增加filepaths.xml文件

<?xml?version="1.0"?encoding="utf-8"?>
<resources>
????<paths>
????????<external-path
????????????name="external_path"
????????????path="."?/>
????</paths>
</resources>

修改MainActivity.java文件為

package?com.example.androidcamera;

import?androidx.annotation.Nullable;
import?androidx.appcompat.app.AppCompatActivity;
import?androidx.core.content.FileProvider;

import?android.content.ActivityNotFoundException;
import?android.content.ContentValues;
import?android.content.Context;
import?android.content.Intent;
import?android.graphics.Bitmap;
import?android.graphics.BitmapFactory;
import?android.net.Uri;
import?android.os.Build;
import?android.os.Bundle;
import?android.os.Environment;
import?android.provider.MediaStore;
import?android.view.View;
import?android.widget.ImageView;

import?java.io.File;
import?java.io.FileInputStream;
import?java.io.FileNotFoundException;
import?java.io.IOException;

public?class?MainActivity?extends?AppCompatActivity?{

????private?static?int?REQ_1?=?1;
????private?static?int?REQ_2?=?2;
????private?ImageView?mImageView;
????private?String?mFilePath;

????@Override
????protected?void?onCreate(Bundle?savedInstanceState)?{
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.activity_main);
????????mImageView?=?(ImageView)?findViewById(R.id.iv);
????????mFilePath?=?Environment.getExternalStorageDirectory().getPath();
????????mFilePath?=?mFilePath?+?"/"?+?"temp.png";
????}

????public?void?startCamera1(View?view){
????????Intent?intent=?new?Intent(MediaStore.ACTION_IMAGE_CAPTURE);
????????startActivityForResult(intent,?REQ_1);
????}

????public?void?startCamera2(View?view){
????????Intent?intent=?new?Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//????????Uri?photoUri?=?Uri.fromFile(new?File(mFilePath));

????????Uri?photoUri?=?getUriForFile(MainActivity.this,new?File(mFilePath));
????????intent.putExtra(MediaStore.EXTRA_OUTPUT,?photoUri);
????????startActivityForResult(intent,?REQ_2);
????}

????private?static?Uri?getUriForFile(Context?context,?File?file)?{
????????if?(context?==?null?||?file?==?null)?{
????????????throw?new?NullPointerException();
????????}
????????Uri?uri;

????????//判斷是否是AndroidN以及更高的版本
????????if?(Build.VERSION.SDK_INT?>=?Build.VERSION_CODES.N)?{
????????????//如果SDK版本>=24，即：Build.VERSION.SDK_INT?>=?24
????????????//?uri?=?FileProvider.getUriForFile(context,?BuildConfig.APPLICATION_ID?+?".fileProvider",?file);
????????????uri?=?FileProvider.getUriForFile(context,?"com.example.androidcamera.fileprovider",?file);
????????}?else?{
????????????uri?=?Uri.fromFile(file);
????????}
????????return?uri;
????}

????private?Intent?getInstallIntent()?{

????????String?savePath?=?"null";
????????String?appName?=?"AndroidCamera";
????????String?fileName?=?savePath?+?appName?+?".apk";
????????Uri?uri?=?null;
????????Intent?intent?=?new?Intent(Intent.ACTION_VIEW);
????????try?{
????????????if?(Build.VERSION.SDK_INT?>=?24)?{//7.0?Android?N????
????????????????//com.xxx.xxx.fileprovider為上述manifest中provider所配置相同
????????????????Context?mContext?=?null;
????????????????uri?=?FileProvider.getUriForFile(mContext,?"com.example.androidcamera.fileprovider",?new?File(fileName));

????????????????intent.setAction(Intent.ACTION_INSTALL_PACKAGE);
????????????????intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);//7.0以后，系統要求授予臨時uri讀取權限，安裝完畢以后，系統會自動收回權限，該過程沒有用戶交互
????????????}?else?{//7.0以下
????????????????uri?=?Uri.fromFile(new?File(fileName));
????????????????intent.setAction(Intent.ACTION_VIEW);
????????????????intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
????????????}
????????????intent.setDataAndType(uri,?"application/vnd.android.package-archive");
????????????startActivity(intent);
????????????return?intent;
????????}?catch?(IllegalArgumentException?e)?{
????????????e.printStackTrace();
????????????e.printStackTrace();
????????}catch?(Exception?e){?
????????????
????????}
????????return?intent;
????}


????@Override
????protected?void?onActivityResult(int?requestCode,?int?resultCode,?@Nullable?Intent?data)?{
????????super.onActivityResult(requestCode,?resultCode,?data);
????????if?(resultCode?==?RESULT_OK)?{
????????????if?(requestCode?==?REQ_1)?{
????????????????Bundle?bundle?=?data.getExtras();
????????????????Bitmap?bitmap?=?(Bitmap)?bundle.get("data");
????????????????mImageView.setImageBitmap(bitmap);
????????????}?else?if?(requestCode?==?REQ_2)?{
????????????????FileInputStream?fis?=?null;
????????????????try?{
????????????????????fis?=new?FileInputStream(mFilePath);
????????????????????Bitmap?bitmap?=?BitmapFactory.decodeStream(fis);
????????????????????mImageView.setImageBitmap(bitmap);
????????????????}?catch?(FileNotFoundException?e)?{
????????????????????e.printStackTrace();
????????????????}?finally?{
????????????????????try?{
????????????????????????fis.close();
????????????????????}?catch?(IOException?e)?{
????????????????????????e.printStackTrace();
????????????????????}
????????????????}

????????????}
????????}
????}
}

這們startCamera2就能在真手機上打開拍照了。

0 回復有任何疑惑可以回復我~

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哈哈6806406

改了之后，startcamera可以進入拍照頁面，但是點擊拍照后調到原始頁面沒有照片顯示，也找不到存儲地址。

2021-05-28 回復有任何疑惑可以回復我~

慕粉2357434992
2020-06-19

背景：

????在安卓7.0手機上，調用系統相機拍照，結果出現閃退。

原因：

解決方案：
?

????public?void?openCamera()?{
????????Intent?intent?=?new?Intent(MediaStore.ACTION_IMAGE_CAPTURE);
????????imageUri?=?getImageUri();
????????intent.putExtra(MediaStore.EXTRA_OUTPUT,?imageUri);
????????startActivityForResult(intent,?PHOTO_REQUEST_CAMERA);
????}
?
????public?Uri?getImageUri()?{
????????File?file?=?new?File(Environment.getExternalStorageDirectory(),?"/temp/"?+?System.currentTimeMillis()?+?".jpg");
????????if?(!file.getParentFile().exists())?{
????????????file.getParentFile().mkdirs();
????????}
????????String?path?=?file.getPath();
????????if?(Build.VERSION.SDK_INT?<?Build.VERSION_CODES.N)?{
????????????imageUri?=?Uri.fromFile(file);
????????}?else?{
????????????//兼容android7.0?使用共享文件的形式
????????????ContentValues?contentValues?=?new?ContentValues(1);
????????????contentValues.put(MediaStore.Images.Media.DATA,?path);
????????????imageUri?=?this.getApplication().getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,?contentValues);
????????}
????????return?imageUri;
????}

0 回復有任何疑惑可以回復我~

收起回答