【安卓开发】调用手机的相机进行拍照并且保存在本地的APP

官网文档

点击拍照后可以进行拍照，并且将得到的照片展现在屏幕上

添加相机权限

JAVA代码

package Picture;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.graphics.Bitmap;
import android.media.Image;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.ImageView;

import com.example.myapp_b.R;

public class MainActivity extends AppCompatActivity {
    ImageView imageView;
    static final int REQUEST_IMAGE_CAPTURE=1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        imageView=findViewById(R.id.iv);
    }

    public void takePic(View view) {
        Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if(intent.resolveActivity(getPackageManager())!=null){
            startActivityForResult(intent,REQUEST_IMAGE_CAPTURE);
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            Bundle extras = data.getExtras();
            Bitmap imageBitmap = (Bitmap) extras.get("data");
            imageView.setImageBitmap(imageBitmap);
        }
    }

}

XML代码

package Picture;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.FileProvider;

import android.content.Intent;
import android.graphics.Bitmap;
import android.media.Image;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.view.View;
import android.widget.ImageView;

import com.example.myapp_b.R;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MainActivity extends AppCompatActivity {
    ImageView imageView;
    static final int REQUEST_IMAGE_CAPTURE=1;
    static final int RESULT_OK=-1;
    String path="";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        imageView=findViewById(R.id.iv);
    }

    public void takePic(View view) throws IOException {
        Intent intent=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//开启系统相机的意图对象
        String imagePath= Environment.getExternalStorageDirectory()+"/DCIM";//设置照片保存路径
        File file=new File(imagePath, "default_image.jpg");
        //File file=createImageFile();
        path=file.getAbsolutePath();
        //使用文件提供者获取路径URL
        Uri contentUri= FileProvider.getUriForFile(this,"com.example.android.fileprovider",file);
        //设置传递参数 让相机拍照后保存照片
        intent.putExtra(MediaStore.EXTRA_OUTPUT,contentUri);
        startActivityForResult(intent,1);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            //1.设置扫描意图
            Intent mediaScanIntent=new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
            //2.设置路径
            File f=new File(path);
            //3.获取路径
            Uri contenturi=Uri.fromFile(f);//file:///storage/emulated/0/DCIM/default_image.jpg
            mediaScanIntent.setData(contenturi);
            System.out.println(contenturi.toString());
            //4.发送广播
            this.sendBroadcast(mediaScanIntent);
//            Bundle extras = data.getExtras();
//            Bitmap imageBitmap = (Bitmap) extras.get("data");
//            imageView.setImageBitmap(imageBitmap);
        }
    }
    private File createImageFile() throws IOException {
        // 创建独一无二的文件名
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(
                imageFileName,  
                ".jpg",         
                storageDir      
        );

        // Save a file: path for use with ACTION_VIEW intents
        path = image.getAbsolutePath();
        return image;
    }

}

配置文件

file_path.xml

上述方法得到的文件名是重复的，参考官网文档可以将其的名字加上时间

String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File file=new File(imagePath, "JPEG_" + timeStamp + ".jpg");