android实现拍照功能

Android中实现拍照有两种方法，一种是调用系统自带的相机，然后使用其返回的照片数据。还有一种是自己用Camera类和其他相关类实现相机功能，这种方法定制度比较高，洗染也比较复杂，一般平常的应用只需使用第一种即可。

用Intent启动相机的代码：

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 1);

要将图像存储到SD卡上之前，最好检查一下SD卡是否可用

String sdStatus = Environment.getExternalStorageState();
            if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用
                Log.v("TestFile",
                        "SD card is not avaiable/writeable right now.");
                return;
            }

另外，要注意的是读写SD卡必须在Mainifest.xml文件中配置权限：

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

一个示例如下：

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MainActivity.java:

package com.example.testand;

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

import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		Button button=(Button) findViewById(R.id.button);
		
		button.setOnClickListener(new OnClickListener(){

			@Override
			public void onClick(View v) {
				Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
				startActivityForResult(intent, 1);
				
			}
			
		});
		
		
		
	}

	protected void onActivityResult(int requestCode, int resultCode, Intent data){
		super.onActivityResult(requestCode, resultCode, data);
		
		String sdStatus = Environment.getExternalStorageState();
        if (!sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 检测sd是否可用
            Log.v("TestFile","SD card is not avaiable/writeable right now.");
            return;
        }
        Bundle bundle = data.getExtras();
        Bitmap bitmap = (Bitmap) bundle.get("data");// 获取相机返回的数据，并转换为Bitmap图片格式
        File file = new File("/sdcard/myImage/");
        FileOutputStream bout = null;
        
        file.mkdirs();// 创建文件夹
        String fileName = "/sdcard/myImage/111.jpg";

        try {
        	bout = new FileOutputStream(fileName);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bout);// 把数据写入文件
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            try {
            	bout.flush();
            	bout.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        ((ImageView) findViewById(R.id.imageView)).setImageBitmap(bitmap);// 将图片显示在ImageView里
	}
	
	
	@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;
	}

}

activity_main.xml:

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

   

    <Button
        android:id="@+id/button"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="点击启动相机" />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button"
        android:layout_alignParentBottom="true"
        android:layout_below="@+id/button"
        android:background="#999999" />
    
</RelativeLayout>

AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testand"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.testand.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>
        <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
        <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

</manifest>

android实现拍照功能

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