如何将捕获的图像保存到内部存储器

Question

嗨，大家好，我想在我的相机应用程序中添加一个选项，当用户打开一个应用程序时，会弹出一个弹出窗口，其中包含一个选项，用于保存捕获的图像，弹出时需要包含相机默认存储的子文件夹。一个创建新文件夹并重命名的选项，然后按回车键，他捕获的任何内容都会保存在同一文件夹中，一旦他想将图像保存到下一个文件夹，用户应该可以从应用程序栏中的设置中进行选择按下将显示相同的弹出窗口，并带有使用相同子文件夹保存捕获图像的位置的选项。

我的主要活动包含

 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.sairamkrishna.myapplication" > <uses-permission android:name="android.permission.CAMERA" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.sairamkrishna.myapplication.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> 

 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> </RelativeLayout> 

 package com.example.sairamkrishna.myapplication; import android.Manifest; import android.app.Activity; import android.app.AlertDialog; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.SharedPreferences; import android.content.pm.PackageManager; import android.net.Uri; import android.os.Bundle; import android.provider.Settings; import android.support.v4.app.ActivityCompat; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; public class MainActivity extends AppCompatActivity { public static final int MY_PERMISSIONS_REQUEST_CAMERA = 100; public static final String ALLOW_KEY = "ALLOWED"; public static final String CAMERA_PREF = "camera_pref"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { if (getFromPref(this, ALLOW_KEY)) { showSettingsAlert(); } else if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { // Should we show an explanation? if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA)) { showAlert(); } else { // No explanation needed, we can request the permission. ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA); } } } else { openCamera(); } } public static void saveToPreferences(Context context, String key, Boolean allowed) { SharedPreferences myPrefs = context.getSharedPreferences(CAMERA_PREF, Context.MODE_PRIVATE); SharedPreferences.Editor prefsEditor = myPrefs.edit(); prefsEditor.putBoolean(key, allowed); prefsEditor.commit(); } public static Boolean getFromPref(Context context, String key) { SharedPreferences myPrefs = context.getSharedPreferences(CAMERA_PREF, Context.MODE_PRIVATE); return (myPrefs.getBoolean(key, false)); } private void showAlert() { AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); alertDialog.setTitle("Alert"); alertDialog.setMessage("App needs to access the Camera."); alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "DONT ALLOW", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); finish(); } }); alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "ALLOW", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, MY_PERMISSIONS_REQUEST_CAMERA); } }); alertDialog.show(); } private void showSettingsAlert() { AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); alertDialog.setTitle("Alert"); alertDialog.setMessage("App needs to access the Camera."); alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "DONT ALLOW", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); //finish(); } }); alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "SETTINGS", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); startInstalledAppDetailsActivity(MainActivity.this); } }); alertDialog.show(); } @Override public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) { switch (requestCode) { case MY_PERMISSIONS_REQUEST_CAMERA: { for (int i = 0, len = permissions.length; i < len; i++) { String permission = permissions[i]; if (grantResults[i] == PackageManager.PERMISSION_DENIED) { boolean showRationale = ActivityCompat.shouldShowRequestPermissionRationale( this, permission); if (showRationale) { showAlert(); } else if (!showRationale) { // user denied flagging NEVER ASK AGAIN // you can either enable some fall back, // disable features of your app // or open another dialog explaining // again the permission and directing to // the app setting saveToPreferences(MainActivity.this, ALLOW_KEY, true); } } } } // other 'case' lines to check for other // permissions this app might request } } @Override protected void onResume() { super.onResume(); } public static void startInstalledAppDetailsActivity(final Activity context) { if (context == null) { return; } final Intent i = new Intent(); i.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS); i.addCategory(Intent.CATEGORY_DEFAULT); i.setData(Uri.parse("package:" + context.getPackageName())); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY); i.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS); context.startActivity(i); } private void openCamera() { Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); startActivity(intent); } } 

任何帮助将不胜感激。

Answer 1

不确定是否理解您的问题...但是，如果您想通过应用程序保存一些数据，并且即使不在线也能够在手机中检索它们，则可以使用：window.localStorage

window.localStorage.setItem("itemName", item); // to save it in your phone
window.localStorage.getItem("itemName"); // to retrieve your item

要更新您的商品，可以再次使用setItem（“ itemName”，item）。

它能回答您的问题吗？ :)