Android开发 拍照+读取相册+保存到本地 |
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Android开发 拍照+读取相册+保存到本地
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Android Studio 新建项目，Minimum SDK选择API 28: android 9.0（Pie），在华为Mate20 Pro 测试通过。
AndroidManifest.xml中添加注册
注册除了MainActivity的其他两个界面Albums和Camera，添加provider，申请使用相机的权限，读写权限 activity_main.xml代码 MainActivity.java代码 package com.example.mycamera; import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import android.Manifest; import android.content.Intent; import android.content.pm.PackageManager; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageView; public class MainActivity extends AppCompatActivity { public static final int TAKE_PHOTO = 1; public static final int CHOOSE_PHOTO = 2; private ImageView picture; private Intent intent1,intent2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button chooseFromAlbum = findViewById(R.id.choose_from_album); chooseFromAlbum.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, CHOOSE_PHOTO); } else { openAlbum();//打开album的界面 } } }); Button takePhoto = findViewById(R.id.take_photo); picture = findViewById(R.id.picture); takePhoto.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // 动态申请权限 if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, TAKE_PHOTO); } else { // 启动相机程序 startCamera(); } } }); intent1=new Intent(this,Albums.class);//创建跳转到Albums显示的窗口的Intent intent2=new Intent(this,Camera.class);//创建跳转到Camera显示的窗口的Intent } private void openAlbum() { startActivity(intent1);//进入album的窗口界面 } private void startCamera() { startActivity(intent2);//进入camera的窗口界面 } } albums.xml代码 Albums.java代码 package com.example.mycamera; import android.Manifest; import android.annotation.TargetApi; import android.app.Activity; import android.content.ContentResolver; import android.content.ContentUris; import android.content.Intent; import android.content.pm.PackageManager; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.provider.DocumentsContract; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import androidx.annotation.Nullable; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; public class Albums extends Activity { private ImageView albumsPicture; public static final int CHOOSE_PHOTO = 2; private Button pestDection=null; private Button pictureSave=null; private Intent intent2; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.albums); pestDection=super.findViewById(R.id.pestDetection); pictureSave=super.findViewById(R.id.pictureSave); albumsPicture = super.findViewById(R.id.picture); if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, CHOOSE_PHOTO); } else { openAlbum(); } intent2 = new Intent(getApplicationContext(),MainActivity.class); //receivePicturefromMainActivaty(); pestDection.setOnClickListener(new pestDectionFuntion()); pictureSave.setOnClickListener(new pictureSaveFunction()); } private void openAlbum() { Intent intent = new Intent("android.intent.action.GET_CONTENT"); intent.setType("image/*"); startActivityForResult(intent, CHOOSE_PHOTO);//打开相册 } private class pestDectionFuntion implements View.OnClickListener { public void onClick(View view){ Toast.makeText(getApplicationContext(),"粮虫检测",Toast.LENGTH_SHORT).show(); } } private class pictureSaveFunction implements View.OnClickListener { public void onClick(View view){ //Toast.makeText(getApplicationContext(),"图片保存成功！",Toast.LENGTH_SHORT).show(); //Intent intent2 = new Intent(getApplicationContext(),MainActivity.class);//创建窗口切换的Intent,MainActivity.class指切换到主界面 //Bitmap savepicture=loadBitmapFromView(albumsPicture); //String name=String.valueOf(System.currentTimeMillis()); BitmapDrawable bmpDrawable = (BitmapDrawable) albumsPicture.getDrawable(); Bitmap bitmap = bmpDrawable.getBitmap(); saveToSystemGallery(bitmap);//将图片保存到本地 Toast.makeText(getApplicationContext(),"图片保存成功！",Toast.LENGTH_SHORT).show(); startActivity(intent2);//窗口切换 } } public void saveToSystemGallery(Bitmap bmp) { // 首先保存图片 File appDir = new File(Environment.getExternalStorageDirectory(), "MyAlbums"); if (!appDir.exists()) { appDir.mkdir(); } String fileName = System.currentTimeMillis() + ".jpg"; File file = new File(appDir, fileName); try { FileOutputStream fos = new FileOutputStream(file); bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos); fos.flush(); fos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } // 其次把文件插入到系统图库 //sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(file.getAbsolutePath()))); Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri uri = Uri.fromFile(file); intent.setData(uri); sendBroadcast(intent); // 发送广播，通知图库更新 } // 使用startActivityForResult()方法开启Intent的回调 @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { //返回成功，请求码（对应启动时的requestCode） if(resultCode == RESULT_OK && CHOOSE_PHOTO == 2) { //方式一（不建议使用） //下面的一句代码，也可以把图片显示在ImageView中 //但图片过大的时候，将无法显示，所以 //img.setImageURI(data.getData()); //方式二 Uri uri = data.getData(); ContentResolver cr = this.getContentResolver(); try { //根据Uri获取流文件 InputStream is = cr.openInputStream(uri); BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize =3; Bitmap bitmap = BitmapFactory.decodeStream(is,null,options); albumsPicture.setImageBitmap(bitmap); } catch(Exception e) { Log.i("lyf", e.toString()); } } super.onActivityResult(requestCode, resultCode, data); } @TargetApi(19) private void handleImageOnKitkat(Intent data) { String imagePath = null; Uri uri = data.getData(); if (DocumentsContract.isDocumentUri(this, uri)) { //如果是document类型的uri，则通过document id处理 String docId = DocumentsContract.getDocumentId(uri); if ("com.android.providers.media.documents".equals(uri.getAuthority())) { String id = docId.split(":")[1]; String selection = MediaStore.Images.Media._ID + "=" + id; imagePath = getImagePath( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection); } else if ("com.android.providers.downloads.documents".equals(uri.getAuthority())) { Uri contentUri = ContentUris.withAppendedId(Uri.parse("content:" + "//downloads/public_downloads"), Long.valueOf(docId)); imagePath = getImagePath(contentUri, null); } } else if ("content".equalsIgnoreCase(uri.getScheme())) { //如果是content类型的uri，则使用普通方式处理 imagePath = getImagePath(uri, null); } else if ("file".equalsIgnoreCase(uri.getScheme())) { //如果是File类型的uri，直接获取图片路径即可 imagePath = uri.getPath(); } //根据图片路径显示图片 displayImage(imagePath); } private void handleImageBeforeKitKat(Intent data){ Uri uri=data.getData(); String imagePath=getImagePath(uri,null); displayImage(imagePath); } private String getImagePath(Uri uri,String selection){ String path=null; Cursor cursor=getContentResolver().query(uri,null,selection,null,null); if(cursor!=null){ if(cursor.moveToFirst()){ path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA)); } cursor.close(); } return path; } private void displayImage(String imagePath){ if(imagePath!=null){ Bitmap bitmap=BitmapFactory.decodeFile(imagePath); albumsPicture.setImageBitmap(bitmap);//将图片放置在控件上 }else { Toast.makeText(this,"得到图片失败",Toast.LENGTH_SHORT).show(); } } } camera.xml代码 Camera.java代码 package com.example.mycamera; import android.Manifest; import android.app.Activity; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.net.Uri; import android.os.Build; import android.os.Bundle; import android.os.Environment; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; import androidx.core.content.FileProvider; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; public class Camera extends Activity { private ImageView cameraPicture; public static final int TAKE_PHOTO = 1; private Button pestDection=null; private Button pictureSave=null; private Intent intent3; private Uri imageUri; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.albums); pestDection=super.findViewById(R.id.pestDetection); pictureSave=super.findViewById(R.id.pictureSave); cameraPicture = super.findViewById(R.id.picture); // 创建一个File对象，用于保存摄像头拍下的图片，这里把图片命名为output_image.jpg // 并将它存放在手机SD卡的应用关联缓存目录下 File outputImage = new File(getExternalCacheDir(), "output_image.jpg"); // 对照片的更换设置 try { // 如果上一次的照片存在，就删除 if (outputImage.exists()) { outputImage.delete(); } // 创建一个新的文件 outputImage.createNewFile(); } catch (IOException e) { e.printStackTrace(); } // 如果Android版本大于等于7.0 if (Build.VERSION.SDK_INT >= 24) { // 将File对象转换成一个封装过的Uri对象 imageUri = FileProvider.getUriForFile(this, "com.example.lenovo.cameraalbumtest.fileprovider", outputImage); Log.d("MainActivity", outputImage.toString() + "手机系统版本高于Android7.0"); } else { // 将File对象转换为Uri对象，这个Uri标识着output_image.jpg这张图片的本地真实路径 Log.d("MainActivity", outputImage.toString() + "手机系统版本低于Android7.0"); imageUri = Uri.fromFile(outputImage); } // 动态申请权限 if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions( this, new String[]{Manifest.permission.CAMERA}, TAKE_PHOTO); } else { // 启动相机程序 startCamera(); } intent3 = new Intent(getApplicationContext(),MainActivity.class); pestDection.setOnClickListener(new Camera.pestDectionFuntion()); pictureSave.setOnClickListener(new Camera.pictureSaveFunction()); } private void startCamera() { Intent intent4 = new Intent("android.media.action.IMAGE_CAPTURE"); // 指定图片的输出地址为imageUri intent4.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); startActivityForResult(intent4, TAKE_PHOTO); } private class pestDectionFuntion implements View.OnClickListener { public void onClick(View view){ Toast.makeText(getApplicationContext(),"粮虫检测",Toast.LENGTH_SHORT).show(); } } private class pictureSaveFunction implements View.OnClickListener { public void onClick(View view){ BitmapDrawable bmpDrawable = (BitmapDrawable) cameraPicture.getDrawable(); Bitmap bitmap = bmpDrawable.getBitmap(); saveToSystemGallery(bitmap);//将图片保存到本地 Toast.makeText(getApplicationContext(),"图片保存成功！",Toast.LENGTH_SHORT).show(); startActivity(intent3);//窗口切换 } } @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { switch (requestCode) { case TAKE_PHOTO: if (requestCode == TAKE_PHOTO && resultCode == RESULT_OK ) { try { // 将图片解析成Bitmap对象 Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri)); cameraPicture.setImageBitmap(bitmap); } catch (FileNotFoundException e) { e.printStackTrace(); } } break; default: break; } } public void saveToSystemGallery(Bitmap bmp) { // 首先保存图片 File appDir = new File(Environment.getExternalStorageDirectory(), "Mycamera"); if (!appDir.exists()) { appDir.mkdir(); } String fileName = System.currentTimeMillis() + ".jpg"; File file = new File(appDir, fileName); try { FileOutputStream fos = new FileOutputStream(file); bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos); fos.flush(); fos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } // 其次把文件插入到系统图库 //sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse(file.getAbsolutePath()))); Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri uri = Uri.fromFile(file); intent.setData(uri); sendBroadcast(intent);// 发送广播，通知图库更新 } }file_path.xml代码 如果虚拟机可以运行，手机不能安装，gradle.properties里面添加 android.injected.testOnly=false文件结构
https://wwzb.lanzoue.com/imUKH0n1nq4d 密码:1eda 分享Demo可试试效果 参考来源： Android studio调用手机相机拍照显示并保存+读取本地相册并显示_金子007的博客-CSDN博客_android sttudio查看手机相册Android ImageView显示本地图片 - 末日之花 - 博客园 |
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