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);
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 >
小米手机亲测可用。 源码：
url: