Android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：

   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");

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;
    
             }
   

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"
     
    />
   

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
    >