android 自定义相机



import android.app.Activity;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.os.Environment;
import android.preference.DialogPreference;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

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

import static android.graphics.PixelFormat.*;

/**
 * Created by Administrator on 2016/1/21.
 */
public class CameraActivity extends Activity {
    private Camera camera;
    private boolean isPrivate = false;//是否为预览模式
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.camera);
        //判断是否安装SD卡
        if(!android.os.Environment.getExternalStorageState().equals(Environment
        .MEDIA_MOUNTED)){
            Toast.makeText(this,"未安装SD卡",Toast.LENGTH_LONG).show();
            return;
        }
        SurfaceView sv = (SurfaceView) findViewById(R.id.sufaceview1);
        final SurfaceHolder sh = sv.getHolder();
        Button yl = (Button) findViewById(R.id.yl);
        Button pz = (Button) findViewById(R.id.pz);
        sh.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);//设置该surface不维护缓冲
        final Camera.PictureCallback jpeg = new Camera.PictureCallback() {
            @Override
            public void onPictureTaken(byte[] data, Camera camera) {
                //根据拍照所得的数据创建位图
                final Bitmap bitmap = BitmapFactory.decodeByteArray(data,0,data.length);
                //加载layout/save.xml文件对应的布局资源
                View saveView  = getLayoutInflater().inflate(R.layout.save,null);
                final EditText photoName = (EditText) saveView.findViewById(R.id.photo_name);
                ImageView show = (ImageView) saveView.findViewById(R.id.show);
                show.setImageBitmap(bitmap);
                camera.stopPreview();
                isPrivate = false;
                new AlertDialog.Builder(CameraActivity.this).setView(saveView)
                        .setPositiveButton("保存", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                File file = new File("sdcard/pictures/" + photoName
                                .getText().toString().trim() + "jpg");
                                try {
                                    file.createNewFile();
                                    FileOutputStream fileOutputStream = new FileOutputStream(file);
                                    bitmap.compress(Bitmap.CompressFormat.JPEG,100,fileOutputStream);
                                    fileOutputStream.flush();
                                    fileOutputStream.close();
                                    isPrivate = true;
                                    resetCamera();
                                } catch (IOException e) {
                                    e.printStackTrace();
                                }

                            }
                        }).setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        isPrivate = true;
                        resetCamera();
                    }
                }).show();
            }
        };

        yl.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!isPrivate) {//如果相机为非预览模式,则打开相机
                    camera = Camera.open();

                }
                try {
                    camera.setPreviewDisplay(sh);
                    Camera.Parameters parameters = camera.getParameters();//获取相机参数
                    parameters.setPictureSize(640, 280);//预览画面尺寸
                    parameters.setPictureFormat(JPEG);//指定图片为JPEG
                    parameters.set("jpeg-quality", 80);//图片的质量
                    camera.setParameters(parameters);
                    camera.startPreview();//开始预览
                    camera.autoFocus(null);//自动对焦
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        });
        pz.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                camera.takePicture(null,null,jpeg);
            }
        });




    }

    private void resetCamera() {
        if(isPrivate){
            camera.startPreview();
        }
    }

    @Override
    protected void onPause() {

        if(camera!=null){
            camera.stopPreview();
            camera.release();
        }
        super.onPause();
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <Button
            android:id="@+id/yl"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="预览"/>
        <Button
            android:layout_marginLeft="100dp"
            android:id="@+id/pz"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="拍照"/>
        <SurfaceView
            android:id="@+id/sufaceview1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" />

    </RelativeLayout>

</LinearLayout>

save.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <EditText
        android:id="@+id/photo_name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <ImageView
        android:id="@+id/show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>