[转]调用相机并将照片存储到sd卡上

本文转自：http://blog.csdn.net/barryhappy/article/details/7355317

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);

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。

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

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

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;
        }

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”

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：

<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

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

<?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

<?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