我的Android笔记（五）——调用相机并将照片存储到sd卡上

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：

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Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

startActivityForResult(intent, 1);

拍完照后就可以在onActivityResult(int requestCode, int resultCode, Intent data)中获取到Bitmap对象了。

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Bitmap bitmap = (Bitmap) data.getExtras().get("data");

要将图像存储到sd卡之前最好先检查一下sd卡是否可用

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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;

}

以下代码可以实现将图像文件存到“sdcard/myImage/”文件夹下，名称为“111.jpg”

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File file = new File("/sdcard/myImage/");

file.mkdirs();// 创建文件夹

String fileName = "/sdcard/myImage/111.jpg";



try {

b = new FileOutputStream(fileName);

bitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件

} catch (FileNotFoundException e) {

e.printStackTrace();

} finally {

try {

b.flush();

b.close();

} catch (IOException e) {

e.printStackTrace();

}

}

另外要注意的是读写sd卡文件必须首先要在Mainifest.xml文件中配置权限：

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

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

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一个demo，实现调用系统相机拍照，将其显示在屏幕上，并且存到sd卡。

完整代码如下：

MyCaremaActivity.java

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package barry.android.c;



import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;



import android.app.Activity;

import android.content.Intent;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.os.Environment;

import android.provider.MediaStore;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;



public class MyCaremaActivity extends Activity {



@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.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);

}

});

}



@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);



if (resultCode == Activity.RESULT_OK) {



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

FileOutputStream b = null;

File file = new File("/sdcard/myImage/");

file.mkdirs();// 创建文件夹

String fileName = "/sdcard/myImage/111.jpg";



try {

b = new FileOutputStream(fileName);

bitmap.compress(Bitmap.CompressFormat.JPEG, 100, b);// 把数据写入文件

} catch (FileNotFoundException e) {

e.printStackTrace();

} finally {

try {

b.flush();

b.close();

} catch (IOException e) {

e.printStackTrace();

}

}



((ImageView) findViewById(R.id.imageView)).setImageBitmap(bitmap);// 将图片显示在ImageView里

}

}

}

main.xml

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

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

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >





<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="fill_parent"

android:background="#999999" />



</LinearLayout>

AndroidMainifest.xml

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

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

package="barry.android.c"

android:versionCode="1"

android:versionName="1.0" >



<uses-sdk android:minSdkVersion="7" />



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

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



<application

android:icon="@drawable/ic_launcher"

android:label="@string/app_name" >

<activity

android:label="@string/app_name"

android:name=".MyCaremaActivity" >

<intent-filter >

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



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

</intent-filter>

</activity>

</application>



</manifest>

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代码下载：http://download.csdn.net/detail/barryhappy/4138190

小米手机亲测可用。

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原文地址：点击打开链接