參考一下兩篇博文：

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PreviewSize是預覽的大小，也就是拍照前看到的圖片大小

PictureSize是指最終拍攝到的圖片的大小，也就是圖片的質量

新建一個工程PictureDemo，預設空活動

完成後，在MainActivity上新增程式碼：

package com.administrator.picturedemo;

import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;

import java.util.List;


public class MainActivity extends Activity {

    private final String TAG = "test";

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

        Camera camera = Camera.open();

        List<Camera.Size> pictureSizes = camera.getParameters().getSupportedPictureSizes();
        List<Camera.Size> previewSizes = camera.getParameters().getSupportedPreviewSizes();

        for (int i=0; i<pictureSizes.size(); i++) {
            Camera.Size pSize = pictureSizes.get(i);
            Log.i(TAG+"-------initCamera", "---------------------PictureSize.width = "+pSize.width+"-----------------PictureSize.height = "+pSize.height);
        }

        for (int i=0; i<previewSizes.size(); i++) {
            Camera.Size pSize = previewSizes.get(i);
            Log.i(TAG+"--------initCamera", "--------------------previewSize.width = "+pSize.width+"-----------------previewSize.height = "+pSize.height);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}
 

<uses-permission android:name="android.permission.CAMERA" />

上圖中的這些引數就是可以設定的previewSize和pictureSize大小

##################################3

獲得了最終的影象，但是大小卻不是我們希望的，所以想要去修改大小

例項程式，獲得bitmap影象myBitmap，改為600x800大小的影象

        String readPath = "/sdcard/desktop.jpg";
        String writePah = "/sdcard/picSize.jpg";

        Bitmap myBitmap = BitmapFactory.decodeFile(readPath);
        File img = new File(writePah);
        try {
            img.createNewFile();
            FileOutputStream fos = new FileOutputStream(img);

            Bitmap endBit = Bitmap.createScaledBitmap(myBitmap, 600, 800, true); //建立新的影象大小
            endBit.compress(Bitmap.CompressFormat.PNG, 100, fos);
            fos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
 

            Bitmap endBit = Bitmap.createScaledBitmap(myBitmap, 600, 800, true); //建立新的影象大小
            endBit.compress(Bitmap.CompressFormat.PNG, 100, fos);

            myBitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);

新增許可權

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />