Android保存图片到相册
- 效果图
- 代码实现
- activity_main.xml
- MainActivity
- DownloadPhotoUtil
- ImageUtil
效果图
遇见平江路
代码实现
activity_main.xml
代码语言：javascript
复制<?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:orientation="vertical"
tools:context=".MainActivity">
<View
android:layout_width="match_parent"
android:layout_height="200dp"/>
<ImageView
android:id="@ id/bgPhoto"
android:layout_width="340dp"
android:layout_height="254dp"
android:layout_gravity="center"
android:background="@drawable/photo"/>
<Button
android:id="@ id/btn"
android:layout_width="100dp"
android:layout_height="60dp"
android:text="下载"
android:layout_marginTop="20dp"
android:layout_gravity="center"/>
</LinearLayout>
MainActivity
代码语言：javascript
复制package top.gaojc;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import top.gaojc.util.DownloadPhotoUtil;
import top.gaojc.util.ImageUtil;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private ImageView bgPhoto;//图片控件
private Button btn;//下载按钮
private Context mContext = MainActivity.this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bgPhoto = findViewById(R.id.bgPhoto);
btn = findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(mContext, "下载至手机", Toast.LENGTH_SHORT).show();
// 调用相关工具类
DownloadPhotoUtil.requestPermission(MainActivity.this, ImageUtil.createBitmapFromView(bgPhoto));
}
});
}
}
DownloadPhotoUtil
代码语言：javascript
复制package top.gaojc.util;
import android.Manifest;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import android.text.format.DateUtils;
import android.widget.Toast;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
public class DownloadPhotoUtil {
private static Activity mContext;
private static final int REQUEST_CODE_SAVE_IMG = 0;
/**
* 请求读取sd卡的权限
*/
public static void requestPermission(Activity context, Bitmap bitmap) {
mContext = context;
/**
* 添加读写权限
* READ_EXTERNAL_STORAGE：读外部存储的权限
* WRITE_EXTERNAL_STORAGE：写外部存储的权限
*/
String[] mPermissionList = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE};
// 判断有无读写权限
if (hasPermissions(mContext, mPermissionList)) {
// 已同意 去保存
saveImage(context, bitmap);
} else {
// 未同意 申请权限
ActivityCompat.requestPermissions(context, mPermissionList, REQUEST_CODE_SAVE_IMG);
}
}
// 是否有对应权限
public static boolean hasPermissions(Context context, String... perms) {
// 判断sdk版本
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
return true;
}
for (String perm : perms) {
boolean hasPerm = (ContextCompat.checkSelfPermission(context, perm) ==
PackageManager.PERMISSION_GRANTED);
if (!hasPerm) {
return false;
}
}
return true;
}
// 保存图片
public static void saveImage(Context context, Bitmap bitmap) {
if (bitmap == null) {
return;
}
boolean isSaveSuccess;
if (Build.VERSION.SDK_INT < 29) {
isSaveSuccess = saveImageToGallery(context, bitmap);
} else {
isSaveSuccess = saveImageToGallery1(context, bitmap);
}
if (isSaveSuccess) {
Toast.makeText(mContext, "保存图片成功", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(mContext, "保存图片失败，请稍后重试", Toast.LENGTH_SHORT).show();
}
}
/**
* android 10 以下版本
*/
public static boolean saveImageToGallery(Context context, Bitmap image) {
// 首先保存图片
String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() File.separator "dearxy";
File appDir = new File(storePath);
if (!appDir.exists()) {
appDir.mkdir();
}
String fileName = System.currentTimeMillis() ".jpg";
File file = new File(appDir, fileName);
try {
FileOutputStream fos = new FileOutputStream(file);
// 通过io流的方式来压缩保存图片
boolean isSuccess = image.compress(Bitmap.CompressFormat.JPEG, 60, fos);
fos.flush();
fos.close();
// 保存图片后发送广播通知更新数据库
Uri uri = Uri.fromFile(file);
mContext.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
if (isSuccess) {
return true;
} else {
return false;
}
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
/**
* android 10 以上版本
*/
public static boolean saveImageToGallery1(Context context, Bitmap image) {
Long mImageTime = System.currentTimeMillis();
String imageDate = new SimpleDateFormat("yyyyMMdd-HHmmss").format(new Date(mImageTime));
String SCREENSHOT_FILE_NAME_TEMPLATE = "winetalk_%s.png";//图片名称，以"winetalk" 时间戳命名
String mImageFileName = String.format(SCREENSHOT_FILE_NAME_TEMPLATE, imageDate);
final ContentValues values = new ContentValues();
values.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_PICTURES
File.separator "winetalk"); //Environment.DIRECTORY_SCREENSHOTS:截图,图库中显示的文件夹名。"dh"
values.put(MediaStore.MediaColumns.DISPLAY_NAME, mImageFileName);
values.put(MediaStore.MediaColumns.MIME_TYPE, "image/png");
values.put(MediaStore.MediaColumns.DATE_ADDED, mImageTime / 1000);
values.put(MediaStore.MediaColumns.DATE_MODIFIED, mImageTime / 1000);
values.put(MediaStore.MediaColumns.DATE_EXPIRES, (mImageTime DateUtils.DAY_IN_MILLIS) / 1000);
values.put(MediaStore.MediaColumns.IS_PENDING, 1);
ContentResolver resolver = context.getContentResolver();
final Uri uri = resolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
try {
// First, write the actual data for our screenshot
try (OutputStream out = resolver.openOutputStream(uri)) {
if (!image.compress(Bitmap.CompressFormat.PNG, 100, out)) {
return false;
}
}
// Everything went well above, publish it!
values.clear();
values.put(MediaStore.MediaColumns.IS_PENDING, 0);
values.putNull(MediaStore.MediaColumns.DATE_EXPIRES);
resolver.update(uri, values, null, null);
} catch (IOException e) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R){
resolver.delete(uri, null);
}
return false;
}
return true;
}
}
ImageUtil
代码语言：javascript
复制package top.gaojc.util;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.widget.ImageView;
public class ImageUtil {
// view转bitmap
public static Bitmap createBitmapFromView(View view) {
//是ImageView直接获取
if (view instanceof ImageView) {
Drawable drawable = ((ImageView) view).getDrawable();
if (drawable instanceof BitmapDrawable) {
return ((BitmapDrawable) drawable).getBitmap();
}
}
view.clearFocus();
Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
if (bitmap != null) {
Canvas canvas = new Canvas(bitmap);
view.draw(canvas);
canvas.setBitmap(null);
}
return bitmap;
}
}
