Android中调用摄像头拍照保存，并在相册中选择图片显示

我的配置是：

android手机版本是7.0

android studio是3.1

android平台是9.0

我的测试都是在真机上进行的。

首先来看代码：

package com.example.sunshunli.cameraalbumtest;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.support.annotation.Nullable;import android.support.v4.content.FileProvider;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ImageView;import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;public class MainActivity extends AppCompatActivity {    public static final int TAKE_PHOTO = 1;    private ImageView picture;    private Uri imageUri;    private static final String TAG = "MainActivity";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        final Button takephoto = findViewById(R.id.take_photo);        picture = findViewById(R.id.picture);        takephoto.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {               // 用来存放摄像头拍下的图片，把图片命名为output_image.jpg                File outputImage = new File(Environment.getExternalStorageDirectory(), "output_image.jpg");                try {                    if (outputImage.exists()) {                        outputImage.delete();                    }                    outputImage.createNewFile();                } catch (IOException e) {                    e.printStackTrace();                }                //第二种方法（推荐使用第二种方法）//                File file=new File(Environment.getExternalStorageDirectory(), "/temp/"+System.currentTimeMillis() + ".jpg");//                if (!file.getParentFile().exists())file.getParentFile().mkdirs();//                Uri imageUri = FileProvider.getUriForFile(MainActivity.this, "com.example.sunshunli.cameraalbumtest.fileprovider", file);//通过FileProvider创建一个content类型的Uri//                Intent intent = new Intent();//                intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); //添加这一句表示对目标应用临时授权该Uri所代表的文件//                intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);//设置Action为拍照//                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);//将拍取的照片保存到指定URI//                startActivityForResult(intent,1006);                if (Build.VERSION.SDK_INT >= 24) {                    imageUri = FileProvider.getUriForFile(MainActivity.this,"com.example.sunshunli.cameraalbumtest.fileprovider",outputImage);                } else {                    //将File对象转换成URI对象，这个URI对象标识着output_image.jpg这张图片的本地真是路径                    imageUri = Uri.fromFile(outputImage);                      }                    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);                    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);                    startActivityForResult(intent, TAKE_PHOTO);                }        });    }    @Override    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {        super.onActivityResult(requestCode, resultCode, data);        switch (requestCode) {            case TAKE_PHOTO:                if (resultCode == RESULT_OK) {                    try {                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));                        picture.setImageBitmap(bitmap);                        Log.d(TAG, "requestCode:"+requestCode);//1                        Log.d(TAG, "data: "+data);//intent{}                        Log.d(TAG, "resultCode: "+resultCode);//-1                    } catch (FileNotFoundException e) {                        e.printStackTrace();                    }                }                break;            default:                break;        }    }}

startActivityForResult(intent, TAKE_PHOTO);

这是我们用来启动另一个拍照活动的，这个与startactivity是不一样的，startactivity只有一个参数，intent，这个有两个参数，第二个参数是requestcode，请求码，我们让请求码为1.

如果想在Activity中得到新打开Activity 关闭后返回的数据，需要使用系统提供的startActivityForResult(Intent intent, int requestCode)方法打开新的Activity，新的Activity 关闭后会向前面的Activity传回数据，为了得到传回的数据，必须在前面的Activity中重写onActivityResult(int requestCode, int resultCode, Intent data)方法。

我们在拍照结束后会有一个resultcode，如果拍照成功的话就会执行下面的操作。

<?xml version="1.0" encoding="utf-8"?>

<?xml version="1.0" encoding="utf-8"?>

<?xml version="1.0" encoding="utf-8"?>

下面我们介绍一下在相册中选择图片并显示

package com.example.sunshunli.cameraalbumtest;import android.Manifest;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.net.Uri;import android.os.Build;import android.os.Bundle;import android.os.Environment;import android.provider.DocumentsContract;import android.provider.MediaStore;import android.support.annotation.NonNull;import android.support.annotation.Nullable;import android.support.v4.app.ActivityCompat;import android.support.v4.content.ContextCompat;import android.support.v4.content.FileProvider;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ImageView;import android.widget.Toast;import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;public class MainActivity extends AppCompatActivity {    public static final int TAKE_PHOTO = 1;    public static final int CHOOSE_PHOTO = 2;    private ImageView picture;    private Uri imageUri;    private static final String TAG = "MainActivity";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button takephoto = findViewById(R.id.take_photo);        Button choosefromablum = findViewById(R.id.choose_from_ablum);        picture = findViewById(R.id.picture);        takephoto.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                // 用来存放摄像头拍下的图片，把图片命名为output_image.jpg                File outputImage = new File(Environment.getExternalStorageDirectory(), "output_image.jpg");                try {                    if (outputImage.exists()) {                        outputImage.delete();                    }                    outputImage.createNewFile();                } catch (IOException e) {                    e.printStackTrace();                }                //第二种方法（推荐使用第二种方法）//                File file=new File(Environment.getExternalStorageDirectory(), "/temp/"+System.currentTimeMillis() + ".jpg");//                if (!file.getParentFile().exists())file.getParentFile().mkdirs();//                Uri imageUri = FileProvider.getUriForFile(MainActivity.this, "com.example.sunshunli.cameraalbumtest.fileprovider", file);//通过FileProvider创建一个content类型的Uri//                Intent intent = new Intent();//                intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); //添加这一句表示对目标应用临时授权该Uri所代表的文件//                intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);//设置Action为拍照//                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);//将拍取的照片保存到指定URI//                startActivityForResult(intent,1006);                if (Build.VERSION.SDK_INT >= 24) {                    imageUri = FileProvider.getUriForFile(MainActivity.this, "com.example.sunshunli.cameraalbumtest.fileprovider", outputImage);                } else {                    //将File对象转换成URI对象，这个URI对象标识着output_image.jpg这张图片的本地真是路径                    imageUri = Uri.fromFile(outputImage);                }                Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);                startActivityForResult(intent, TAKE_PHOTO);            }        });        choosefromablum.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}, 1);                } else {                    openAlbum();                }            }        });    }    private void openAlbum() {        Intent intent = new Intent("android.intent.action.GET_CONTENT");        intent.setType("image/*");        startActivityForResult(intent, CHOOSE_PHOTO);    }    @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        super.onRequestPermissionsResult(requestCode, permissions, grantResults);        switch (requestCode) {            case 1:                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {                    openAlbum();                } else {                    Toast.makeText(this, "You denied the permission", Toast.LENGTH_SHORT).show();                }                break;            default:        }    }    @Override    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {        super.onActivityResult(requestCode, resultCode, data);        switch (requestCode) {            case TAKE_PHOTO:                if (resultCode == RESULT_OK) {                    try {                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));                        picture.setImageBitmap(bitmap);                        Log.d(TAG, "requestCode:" + requestCode);//1                        Log.d(TAG, "data: " + data);//intent{}                        Log.d(TAG, "resultCode: " + resultCode);//-1                    } catch (FileNotFoundException e) {                        e.printStackTrace();                    }                }                break;            case CHOOSE_PHOTO:                if (resultCode == RESULT_OK) {                    if (Build.VERSION.SDK_INT >= 19) {                        handleImageOnKitKat(data);                    } else {                        handleImageBeforeKitKat(data);                    }                }                break;            default:                break;        }    }    private void handleImageOnKitKat(Intent data) {        String imagePath = null;        Uri uri = data.getData();        if (DocumentsContract.isDocumentUri(this, uri)) {            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.media.downloads".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())){                imagePath = uri.getPath();            }else if ("file".equalsIgnoreCase(uri.getScheme())){                imagePath=uri.getPath();            }                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.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);            picture.setImageBitmap(bitmap);        }else {            Toast.makeText(this, "failed to get image", Toast.LENGTH_SHORT).show();        }    }}

大家可以一起交流学习，谢谢！

更多相关文章

随机推荐