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);
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;
}
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();
}
}
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" />
< 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
}
}
}
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 >
< 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 >
< 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 >