效果:
注意:
1:網路許可權
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
2:我封裝了一個OKHttp,需要在build.gradle 中加入
compile 'com.squareup.okhttp3:logging-interceptor:3.4.2' 在同步一在
3:用SharedPreferences 儲存和獲取圖片了,將圖片和字串進行了轉換
4: 可以呼叫相機和相簿獲取圖片,並進行剪下
//-----------------我的佈局檔案-----------------------------
<?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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center"
tools:context="tckpicture.bwie.com.tackpicture2.MainActivity">
<ImageView
android:layout_width="200dp"
android:layout_height="200dp"
android:scaleType="fitXY"
android:src="@mipmap/ic_launcher"
android:id="@+id/iv_img"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="相機"
android:id="@+id/bt_camera"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="相簿"
android:id="@+id/bt_xiangce"/>
</LinearLayout>
//-------------我的MainActivity -------------------------
package tckpicture.bwie.com.tackpicture2;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import okhttp3.Request;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ImageView iv_img;
private Button bt_camera;
private Button bt_xiangce;
private static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
private static final int PHOTO_REQUEST_GALLERY = 2;// 從相簿中選擇
private static final int PHOTO_REQUEST_CUT = 3;// 結果
/* 頭像名稱 */
private static final String PHOTO_FILE_NAME = "temp_photo.jpg";
private File tempFile;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
iv_img = (ImageView) findViewById(R.id.iv_img);
bt_camera = (Button) findViewById(R.id.bt_camera);
bt_xiangce = (Button) findViewById(R.id.bt_xiangce);
//從SharedPreferences獲取圖片
getBitmapFromSharedPreferences();
bt_camera.setOnClickListener(this);
bt_xiangce.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_camera:
// 啟用相機
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
// 判斷儲存卡是否可以用,可用進行儲存
if (hasSdcard()) {
tempFile = new File(Environment.getExternalStorageDirectory(), PHOTO_FILE_NAME);
// 從檔案中建立uri
Uri uri = Uri.fromFile(tempFile);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
}
// 開啟一個帶有返回值的Activity,請求碼為PHOTO_REQUEST_CAREMA
startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
break;
case R.id.bt_xiangce:
// 啟用系統相簿,選擇一張圖片
Intent intent1 = new Intent(Intent.ACTION_PICK);
intent1.setType("image/*");
// 開啟一個帶有返回值的Activity,請求碼為PHOTO_REQUEST_GALLERY
startActivityForResult(intent1, PHOTO_REQUEST_GALLERY);
break;
}
}
/*
* 判斷sdcard是否被掛載
*/
private boolean hasSdcard() {
//判斷SD卡手否是安裝好的 media_mounted
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
return true;
} else {
return false;
}
}
/*
* 剪下圖片
*/
private void crop(Uri uri) {
// 裁剪圖片意圖
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
// 裁剪框的比例,1:1
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// 裁剪後輸出圖片的尺寸大小
intent.putExtra("outputX", 250);
intent.putExtra("outputY", 250);
intent.putExtra("outputFormat", "JPEG");// 圖片格式
intent.putExtra("noFaceDetection", true);// 取消人臉識別
intent.putExtra("return-data", true);
// 開啟一個帶有返回值的Activity,請求碼為PHOTO_REQUEST_CUT
startActivityForResult(intent, PHOTO_REQUEST_CUT);
}
/**
*
* @param requestCode
* @param resultCode
* @param data
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PHOTO_REQUEST_GALLERY) {
// 從相簿返回的資料
if (data != null) {
// 得到圖片的全路徑
Uri uri = data.getData();
crop(uri);
}
} else if (requestCode == PHOTO_REQUEST_CAREMA) {
// 從相機返回的資料
if (hasSdcard()) {
crop(Uri.fromFile(tempFile));
} else {
Toast.makeText(MainActivity.this, "未找到儲存卡,無法儲存照片!", Toast.LENGTH_SHORT).show();
}
} else if (requestCode == PHOTO_REQUEST_CUT) {
// 從剪下圖片返回的資料
if (data != null) {
Bitmap bitmap = data.getParcelableExtra("data");
/**
* 獲得圖片
*/
iv_img.setImageBitmap(bitmap);
//儲存到SharedPreferences
saveBitmapToSharedPreferences(bitmap);
}
try {
// 將臨時檔案刪除
tempFile.delete();
} catch (Exception e) {
e.printStackTrace();
}
}
super.onActivityResult(requestCode, resultCode, data);
}
//儲存圖片到SharedPreferences
private void saveBitmapToSharedPreferences(Bitmap bitmap) {
// Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
//第一步:將Bitmap壓縮至位元組陣列輸出流ByteArrayOutputStream
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 80, byteArrayOutputStream);
//第二步:利用Base64將位元組陣列輸出流中的資料轉換成字串String
byte[] byteArray = byteArrayOutputStream.toByteArray();
String imageString = new String(Base64.encodeToString(byteArray, Base64.DEFAULT));
//第三步:將String保持至SharedPreferences
SharedPreferences sharedPreferences = getSharedPreferences("testSP", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("image", imageString);
editor.commit();
//上傳頭像
setImgByStr(imageString,"");
}
/**
* 上傳頭像 此處使用用的OKHttp post請求上傳的圖片
* @param imgStr
* @param imgName
*/
public void setImgByStr(String imgStr, String imgName) {
String url = "http://appserver。。。。。。。";
Map<String, String> params = new HashMap<String, String>();
params.put("id", "引數值");//
params.put("data", imgStr);
OkHttp.postAsync(url, params, new OkHttp.DataCallBack() {
@Override
public void requestFailure(Request request, IOException e) {
Log.i("上傳失敗", "失敗" + request.toString() + e.toString());
}
@Override
public void requestSuccess(String result) throws Exception {
Log.i("上傳成功", result);
}
});
}
//從SharedPreferences獲取圖片
private void getBitmapFromSharedPreferences(){
SharedPreferences sharedPreferences=getSharedPreferences("testSP", Context.MODE_PRIVATE);
//第一步:取出字串形式的Bitmap
String imageString=sharedPreferences.getString("image", "");
//第二步:利用Base64將字串轉換為ByteArrayInputStream
byte[] byteArray=Base64.decode(imageString, Base64.DEFAULT);
if(byteArray.length==0){
iv_img.setImageResource(R.mipmap.ic_launcher);
}else{
ByteArrayInputStream byteArrayInputStream=new ByteArrayInputStream(byteArray);
//第三步:利用ByteArrayInputStream生成Bitmap
Bitmap bitmap= BitmapFactory.decodeStream(byteArrayInputStream);
iv_img.setImageBitmap(bitmap);
}
}
}
//下面是我封裝的一個 OKHttp
注意:需要在build.gradle 中新增下面這句,然後在同步一下
compile 'com.squareup.okhttp3:logging-interceptor:3.4.2'
//----------下面是封裝的OKHttp類------------------
package tckpicture.bwie.com.tackpicture2;
import android.os.Handler;
import android.os.Looper;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.logging.HttpLoggingInterceptor;
/**
* Created by fan on 2016/11/9.
*/
public class OkHttp {
/**
* 靜態例項
*/
private static OkHttp sOkHttpManager;
/**
* okhttpclient例項
*/
private OkHttpClient mClient;
/**
* 因為我們請求資料一般都是子執行緒中請求,在這裡我們使用了handler
*/
private Handler mHandler;
/**
* 構造方法
*/
private OkHttp() {
// // 可以通過實現 Logger 介面更改日誌儲存位置
HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
// mClient = new OkHttpClient.Builder().addInterceptor(loggingInterceptor).build();
mClient = new OkHttpClient();
/**
* 在這裡直接設定連線超時.讀取超時,寫入超時
*/
OkHttpClient.Builder builder = mClient.newBuilder();
builder.connectTimeout(10, TimeUnit.SECONDS);
builder.readTimeout(10, TimeUnit.SECONDS);
builder.writeTimeout(10, TimeUnit.SECONDS);
builder.addInterceptor(loggingInterceptor);
mClient = builder.build();
/**
* 如果是用的3.0之前的版本 使用以下直接設定連線超時.讀取超時,寫入超時
*/
//client.setConnectTimeout(10, TimeUnit.SECONDS);
//client.setWriteTimeout(10, TimeUnit.SECONDS);
//client.setReadTimeout(30, TimeUnit.SECONDS);
/**
* 初始化handler
*/
mHandler = new Handler(Looper.getMainLooper());
}
/**
* 單例模式 獲取OkHttp例項
*
* @return
*/
public static OkHttp getInstance() {
if (sOkHttpManager == null) {
sOkHttpManager = new OkHttp();
}
return sOkHttpManager;
}
//-------------------------同步的方式請求資料--------------------------
/**
* 對外提供的get方法,同步的方式
*
* @param url 傳入的地址
* @return
*/
public static Response getSync(String url) {
//通過獲取到的例項來呼叫內部方法
return sOkHttpManager.inner_getSync(url);
}
/**
* GET方式請求的內部邏輯處理方式,同步的方式
*
* @param url
* @return
*/
private Response inner_getSync(String url) {
Request request = new Request.Builder().url(url).build();
Response response = null;
try {
//同步請求返回的是response物件
response = mClient.newCall(request).execute();
} catch (IOException e) {
e.printStackTrace();
}
return response;
}
/**
* 對外提供的同步獲取String的方法
*
* @param url
* @return
*/
public static String getSyncString(String url) {
return sOkHttpManager.inner_getSyncString(url);
}
/**
* 同步方法
*/
private String inner_getSyncString(String url) {
String result = null;
try {
/**
* 把取得到的結果轉為字串,這裡最好用string()
*/
result = inner_getSync(url).body().string();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
//-------------------------非同步的方式請求資料--------------------------
public static void getAsync(String url, DataCallBack callBack) {
getInstance().inner_getAsync(url, callBack);
}
/**
* 內部邏輯請求的方法
*
* @param url
* @param callBack
* @return
*/
private void inner_getAsync(String url, final DataCallBack callBack) {
final Request request = new Request.Builder().url(url).build();
mClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
deliverDataFailure(request, e, callBack);
}
@Override
public void onResponse(Call call, Response response) throws IOException {
String result = null;
try {
result = response.body().string();
} catch (IOException e) {
deliverDataFailure(request, e, callBack);
}
deliverDataSuccess(result, callBack);
}
});
}
/**
* 分發失敗的時候呼叫
*
* @param request
* @param e
* @param callBack
*/
private void deliverDataFailure(final Request request, final IOException e, final DataCallBack callBack) {
/**
* 在這裡使用非同步處理
*/
mHandler.post(new Runnable() {
@Override
public void run() {
if (callBack != null) {
callBack.requestFailure(request, e);
}
}
});
}
/**
* 分發成功的時候呼叫
*
* @param result
* @param callBack
*/
private void deliverDataSuccess(final String result, final DataCallBack callBack) {
/**
* 在這裡使用非同步執行緒處理
*/
mHandler.post(new Runnable() {
@Override
public void run() {
if (callBack != null) {
try {
callBack.requestSuccess(result);
} catch (Exception e) {
e.printStackTrace();
}
}
}
});
}
/**
* 資料回撥介面
*/
public interface DataCallBack {
void requestFailure(Request request, IOException e);
void requestSuccess(String result) throws Exception;
}
//-------------------------提交表單--------------------------
public static void postAsync(String url, Map<String, String> params, DataCallBack callBack) {
getInstance().inner_postAsync(url, params, callBack);
}
private void inner_postAsync(String url, Map<String, String> params, final DataCallBack callBack) {
RequestBody requestBody = null;
if (params == null) {
params = new HashMap<>();
}
/**
* 如果是3.0之前版本的,構建表單資料是下面的一句
*/
//FormEncodingBuilder builder = new FormEncodingBuilder();
/**
* 3.0之後版本
*/
FormBody.Builder builder = new FormBody.Builder();
/**
* 在這對新增的引數進行遍歷,map遍歷有四種方式,如果想要了解的可以網上查詢
*/
for (Map.Entry<String, String> map : params.entrySet()) {
String key = map.getKey().toString();
String value = null;
/**
* 判斷值是否是空的
*/
if (map.getValue() == null) {
value = "";
} else {
value = map.getValue();
}
/**
* 把key和value新增到formbody中
*/
builder.add(key, value);
}
requestBody = builder.build();
//結果返回
// 請求物件
final Request request = new Request.Builder().url(url).post(requestBody).build();
mClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
deliverDataFailure(request, e, callBack);
}
@Override
public void onResponse(Call call, Response response) throws IOException {
String result = response.body().string();
deliverDataSuccess(result, callBack);
}
});
}
//-------------------------檔案下載--------------------------
public static void downloadAsync(String url, String desDir, DataCallBack callBack) {
getInstance().inner_downloadAsync(url, desDir, callBack);
}
/**
* 下載檔案的內部邏輯處理類
*
* @param url 下載地址
* @param desDir 目標地址
* @param callBack
*/
private void inner_downloadAsync(final String url, final String desDir, final DataCallBack callBack) {
final Request request = new Request.Builder().url(url).build();
mClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
deliverDataFailure(request, e, callBack);
}
@Override
public void onResponse(Call call, Response response) throws IOException {
/**
* 在這裡進行檔案的下載處理
*/
InputStream inputStream = null;
FileOutputStream fileOutputStream = null;
try {
//檔名和目標地址
File file = new File(desDir, getFileName(url));
//把請求回來的response物件裝換為位元組流
inputStream = response.body().byteStream();
fileOutputStream = new FileOutputStream(file);
int len = 0;
byte[] bytes = new byte[2048];
//迴圈讀取資料
while ((len = inputStream.read(bytes)) != -1) {
fileOutputStream.write(bytes, 0, len);
}
//關閉檔案輸出流
fileOutputStream.flush();
//呼叫分發資料成功的方法
deliverDataSuccess(file.getAbsolutePath(), callBack);
} catch (IOException e) {
//如果失敗,呼叫此方法
deliverDataFailure(request, e, callBack);
e.printStackTrace();
} finally {
if (inputStream != null) {
inputStream.close();
}
if (fileOutputStream != null) {
fileOutputStream.close();
}
}
}
});
}
/**
* 根據檔案url獲取檔案的路徑名字
*
* @param url
* @return
*/
private String getFileName(String url) {
int separatorIndex = url.lastIndexOf("/");
String path = (separatorIndex < 0) ? url : url.substring(separatorIndex + 1, url.length());
return path;
}
}
//---------------完了-----------------
package tckpicture.bwie.com.tackpicture2;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import okhttp3.Request;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private ImageView iv_img;
private Button bt_camera;
private Button bt_xiangce;
private static final int PHOTO_REQUEST_CAREMA = 1;// 拍照
private static final int PHOTO_REQUEST_GALLERY = 2;// 從相簿中選擇
private static final int PHOTO_REQUEST_CUT = 3;// 結果
/* 頭像名稱 */
private static final String PHOTO_FILE_NAME = "temp_photo.jpg";
private File tempFile;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
iv_img = (ImageView) findViewById(R.id.iv_img);
bt_camera = (Button) findViewById(R.id.bt_camera);
bt_xiangce = (Button) findViewById(R.id.bt_xiangce);
//從SharedPreferences獲取圖片
getBitmapFromSharedPreferences();
bt_camera.setOnClickListener(this);
bt_xiangce.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.bt_camera:
// 啟用相機
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
// 判斷儲存卡是否可以用,可用進行儲存
if (hasSdcard()) {
tempFile = new File(Environment.getExternalStorageDirectory(), PHOTO_FILE_NAME);
// 從檔案中建立uri
Uri uri = Uri.fromFile(tempFile);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
}
// 開啟一個帶有返回值的Activity,請求碼為PHOTO_REQUEST_CAREMA
startActivityForResult(intent, PHOTO_REQUEST_CAREMA);
break;
case R.id.bt_xiangce:
// 啟用系統相簿,選擇一張圖片
Intent intent1 = new Intent(Intent.ACTION_PICK);
intent1.setType("image/*");
// 開啟一個帶有返回值的Activity,請求碼為PHOTO_REQUEST_GALLERY
startActivityForResult(intent1, PHOTO_REQUEST_GALLERY);
break;
}
}
/*
* 判斷sdcard是否被掛載
*/
private boolean hasSdcard() {
//判斷SD卡手否是安裝好的 media_mounted
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
return true;
} else {
return false;
}
}
/*
* 剪下圖片
*/
private void crop(Uri uri) {
// 裁剪圖片意圖
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
// 裁剪框的比例,1:1
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// 裁剪後輸出圖片的尺寸大小
intent.putExtra("outputX", 250);
intent.putExtra("outputY", 250);
intent.putExtra("outputFormat", "JPEG");// 圖片格式
intent.putExtra("noFaceDetection", true);// 取消人臉識別
intent.putExtra("return-data", true);
// 開啟一個帶有返回值的Activity,請求碼為PHOTO_REQUEST_CUT
startActivityForResult(intent, PHOTO_REQUEST_CUT);
}
/**
*
* @param requestCode
* @param resultCode
* @param data
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PHOTO_REQUEST_GALLERY) {
// 從相簿返回的資料
if (data != null) {
// 得到圖片的全路徑
Uri uri = data.getData();
crop(uri);
}
} else if (requestCode == PHOTO_REQUEST_CAREMA) {
// 從相機返回的資料
if (hasSdcard()) {
crop(Uri.fromFile(tempFile));
} else {
Toast.makeText(MainActivity.this, "未找到儲存卡,無法儲存照片!", Toast.LENGTH_SHORT).show();
}
} else if (requestCode == PHOTO_REQUEST_CUT) {
// 從剪下圖片返回的資料
if (data != null) {
Bitmap bitmap = data.getParcelableExtra("data");
/**
* 獲得圖片
*/
iv_img.setImageBitmap(bitmap);
//儲存到SharedPreferences
saveBitmapToSharedPreferences(bitmap);
}
try {
// 將臨時檔案刪除
tempFile.delete();
} catch (Exception e) {
e.printStackTrace();
}
}
super.onActivityResult(requestCode, resultCode, data);
}
//儲存圖片到SharedPreferences
private void saveBitmapToSharedPreferences(Bitmap bitmap) {
// Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
//第一步:將Bitmap壓縮至位元組陣列輸出流ByteArrayOutputStream
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 80, byteArrayOutputStream);
//第二步:利用Base64將位元組陣列輸出流中的資料轉換成字串String
byte[] byteArray = byteArrayOutputStream.toByteArray();
String imageString = new String(Base64.encodeToString(byteArray, Base64.DEFAULT));
//第三步:將String保持至SharedPreferences
SharedPreferences sharedPreferences = getSharedPreferences("testSP", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("image", imageString);
editor.commit();
//上傳頭像
setImgByStr(imageString,"");
}
/**
* 上傳頭像
* @param imgStr
* @param imgName
*/
public void setImgByStr(String imgStr, String imgName) {
String url = "http://appserver.1035.mobi/MobiSoft/User_upLogo";
Map<String, String> params = new HashMap<String, String>();
params.put("id", "11460047");// 11459832
params.put("data", imgStr);
OkHttp.postAsync(url, params, new OkHttp.DataCallBack() {
@Override
public void requestFailure(Request request, IOException e) {
Log.i("上傳失敗", "失敗" + request.toString() + e.toString());
}
@Override
public void requestSuccess(String result) throws Exception {
Log.i("上傳成功", result);
}
});
}
//從SharedPreferences獲取圖片
private void getBitmapFromSharedPreferences(){
SharedPreferences sharedPreferences=getSharedPreferences("testSP", Context.MODE_PRIVATE);
//第一步:取出字串形式的Bitmap
String imageString=sharedPreferences.getString("image", "");
//第二步:利用Base64將字串轉換為ByteArrayInputStream
byte[] byteArray=Base64.decode(imageString, Base64.DEFAULT);
if(byteArray.length==0){
iv_img.setImageResource(R.mipmap.ic_launcher);
}else{
ByteArrayInputStream byteArrayInputStream=new ByteArrayInputStream(byteArray);
//第三步:利用ByteArrayInputStream生成Bitmap
Bitmap bitmap= BitmapFactory.decodeStream(byteArrayInputStream);
iv_img.setImageBitmap(bitmap);
}
}
}