android照相简单案例

 

main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context="com.mytest.testcamera.MainActivity" >



    <SurfaceView

        android:id="@+id/sf_camera"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_weight="1" />



    <Button

        android:id="@+id/btn_camera"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="照相" />



</LinearLayout>

View Code

 

AndroidMainfest.xml

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

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.mytest.testcamera"

    android:versionCode="1"

    android:versionName="1.0" >



    <uses-sdk

        android:minSdkVersion="14"

        android:targetSdkVersion="21" />



    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name"

            android:screenOrientation="portrait"

            android:theme="@android:style/Theme.Black.NoTitleBar" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />



                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".PictureActivity" >

        </activity>

    </application>



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

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



</manifest>

View Code

 

MainActivity

package com.mytest.testcamera;



import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;



import android.app.Activity;

import android.content.Intent;

import android.hardware.Camera;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;

import android.view.MenuItem;

import android.view.SurfaceHolder;

import android.view.SurfaceHolder.Callback;

import android.widget.Button;

import android.widget.Toast;

import android.view.SurfaceView;

import android.view.View;



public class MainActivity extends Activity {



    private SurfaceView cameraPreview;

    private Button btnCamera;

    private Camera camera = null;

    private Callback camerPreCallBack = new Callback() {



        @Override

        public void surfaceCreated(SurfaceHolder holder) {

            // 加载照相预览

            startPreview();



        }



        @Override

        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {



        }



        @Override

        public void surfaceDestroyed(SurfaceHolder holder) {

            // 停止照相预览

            stopPreview();



        }



    };



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



        cameraPreview = (SurfaceView) findViewById(R.id.sf_camera);



        cameraPreview.getHolder().addCallback(camerPreCallBack);



        btnCamera = (Button) findViewById(R.id.btn_camera);

        btnCamera.setOnClickListener(new View.OnClickListener() {



            @Override

            public void onClick(View v) {



                // 拍照

                camera.takePicture(null, null, new Camera.PictureCallback() {



                    @Override

                    public void onPictureTaken(byte[] data, Camera camera) {



                        // 把图片数据保存到临时目录

                        String path = savePictureFile(data);



                        Log.v("info", "image temp path:" + path);



                        if (path != null) {

                            Intent intent = new Intent(MainActivity.this, PictureActivity.class);

                            intent.putExtra("imgPath", path);

                            startActivity(intent);



                        } else {

                            Toast.makeText(MainActivity.this, "保存照片失败", Toast.LENGTH_SHORT).show();

                        }

                    }

                });

            }

        });

    }



    /**

     * 保存照片到临时目录

     * 

     * @param bytes

     * @return

     */

    private String savePictureFile(byte[] bytes) {

        try {

            File file = File.createTempFile("camera", "img");

            FileOutputStream fos = new FileOutputStream(file);

            fos.write(bytes);

            fos.flush();

            fos.close();



            return file.getAbsolutePath();

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }



        return null;

    }



    private void startPreview() {

        camera = Camera.open();

        try {

            camera.setPreviewDisplay(cameraPreview.getHolder());

            camera.startPreview();

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }



    private void stopPreview() {

        camera.stopPreview();

        camera.release();

    }



    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.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();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }



}

View Code

 

预览PictureActivity.java

package com.mytest.testcamera;



import android.app.Activity;

import android.net.Uri;

import android.os.Bundle;

import android.widget.ImageView;



public class PictureActivity extends Activity {



    private ImageView imageView;

    

    

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        

        imageView = new ImageView(this);

        setContentView(imageView);

        

        String path = getIntent().getStringExtra("imgPath");

        if(path!=null){

            imageView.setImageURI(Uri.parse(path));

        }

    

    }

}

View Code