安卓开启照相机并保存本地显示高清照片

1.activity_main.xml先对界面进行布局：

先上图：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:layout_gravity="center"
    android:gravity="center"
    >

    <com.makeramen.roundedimageview.RoundedImageView
        android:id="@+id/ImageView01"
        android:scaleType="centerCrop"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:src="@mipmap/tx"
        app:riv_oval="true"
        app:riv_corner_radius="100dp"
       />


    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/ImageView01"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="83dp"
        android:text="拍照" />


</LinearLayout>

圆形头像框的RoundedImageView的使用：https://blog.csdn.net/hdhhd/article/details/100073735

MainActivity：

package youli.com.example.administrator.my_camera_demo;

import android.app.Activity;
import android.content.Intent;
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.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import com.makeramen.roundedimageview.RoundedImageView;

import java.io.File;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    private Button btn1;
    private RoundedImageView image;
    private File currentImageFile = null;
    private Bitmap img;
    private String path;
    private File sdCardDir = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();

    }

    private void initView() {

        btn1 = findViewById(R.id.button1); //拍照


        image = findViewById(R.id.ImageView01); //显示照片

//        img = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher_background);
//
//        image.setImageBitmap(img);


        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            sdCardDir = Environment.getExternalStorageDirectory();//获取SDCard目录
        }

        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                File dir = new File(sdCardDir + "/LLWDCZ/lxd_ck/");
                dir.mkdirs();

                currentImageFile = new File(dir, "ck.jpg");

                path = currentImageFile.getPath();

                Log.e("QWE", path + "显示路径");

                if (!currentImageFile.exists()) {
                    try {
                        currentImageFile.createNewFile();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

                Intent it = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                it.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(currentImageFile));
                startActivityForResult(it, Activity.DEFAULT_KEYS_DIALER);

            }
        });


    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        img = getBitemapFromFile(path);
        image.setImageBitmap(img);
    }

    //根据路径来寻找图片并把图片转为Bitmap形式（重要）
    @SuppressWarnings("deprecation")
    public static Bitmap getBitemapFromFile(String fileName) {
        BitmapFactory.Options opt = new BitmapFactory.Options();
        opt.inPreferredConfig = Bitmap.Config.RGB_565;
        opt.inPurgeable = true;
        opt.inInputShareable = true;
        opt.inSampleSize = 2;
        try {
            return BitmapFactory.decodeFile(fileName, opt);
        } catch (Exception ex) {
            return null;
        }
    }

}

最后别忘了权限：在AndroidManifest文件中加入：

 <!-- 在SDCard中创建与删除文件权限 -->
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
    <!-- 往SDCard写入数据权限 -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-feature android:name = "android.hardware.camera" />
    <uses-feature android:name = "android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

OK，欢迎留言