android相机预览

android访问相机使用的是Camera.open 来返回一个Camera对象，设置好显示的视图后，调用Camera的预览功能函数startPreview，停止预览函数是stopPreview!

activity_mail.xml布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/LinearLayout1"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.ssln.camera.MainActivity" >    <VideoView        android:id="@+id/videoView1"        android:layout_width="match_parent"        android:layout_height="300dp" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content" >        <Button            android:id="@+id/button1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="打开" />        <Button            android:id="@+id/button2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="关闭" />    </LinearLayout></LinearLayout>

MainActivity.java

package com.ssln.camera;import java.io.IOException;import android.app.Activity;import android.hardware.Camera;import android.os.Bundle;import android.view.SurfaceHolder;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.VideoView;public class MainActivity extends Activity implements OnClickListener {    private Camera myCamra; // 相机    private VideoView video; // 显示    private Button btnOpen, btnClose;    private boolean isPreview=false;    //是否预览    private SurfaceHolder holder;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        video = (VideoView) findViewById(R.id.videoView1);        btnOpen = (Button) findViewById(R.id.button1);        btnClose = (Button) findViewById(R.id.button2);        btnOpen.setOnClickListener(this);        btnClose.setOnClickListener(this);        holder=video.getHolder();    }    @Override    public void onClick(View v) {        if (v == btnOpen) {            initCamera();        } else if (v == btnClose) {            if(myCamra!=null && isPreview){                myCamra.stopPreview();//停止预览                myCamra.release();      //释放资源                myCamra=null;                        isPreview=false;            }        }    }    /**     * 初始化相机     */    private void initCamera(){        if(!isPreview)        {            myCamra=Camera.open();    //打开相机设备        }        if(myCamra!=null && !isPreview)        {            try {                myCamra.setPreviewDisplay(holder);                myCamra.startPreview();//开始预览            } catch (IOException e) {                e.printStackTrace();            }            isPreview=true;        }            }}

访问相机是需要权限的，记得加上

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.ssln.camera"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="21" />    <!-- 相机访问权限 -->    <uses-permission android:name="android.permission.CAMERA"/>

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />


    <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" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>

效果预览

android相机预览

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