调用系统相册和相机

public class MainActivity extends Activity implements OnClickListener {
public final static int ALBUM_REQUEST_CODE = 1;//相册的返回码
public final static int CAMERA_REQUEST_CODE = 3;//相机的返回码
private static final int CROP_SMALL_PICTURE = 2;//最后都得图片的返回码
public static String SAVED_IMAGE_DIR_PATH = Environment.getExternalStorageDirectory().getPath()
+ "/AppName/camera/";// 拍照路径
static String cameraPath;// 指定存储位置图片的存储路径
protected static Uri tempUri;
private ImageView iv;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button bt=(Button) findViewById(R.id.bt);
Button bt2=(Button) findViewById(R.id.bt2);
iv = (ImageView) findViewById(R.id.iv);
bt.setOnClickListener(this);
bt2.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.bt:
StartXC();
break;
case R.id.bt2:
startCamera();
break;

default:
break;
}
}
//调用相机的方法
public void startCamera() {
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)) {
cameraPath = SAVED_IMAGE_DIR_PATH + System.currentTimeMillis() + ".png";
Intent intent = new Intent();
// 指定开启系统相机的Action
intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
String out_file_path = SAVED_IMAGE_DIR_PATH;
File dir = new File(out_file_path);
if (!dir.exists()) {
dir.mkdirs();
}
// 把文件地址转换成Uri格式
tempUri = Uri.fromFile(new File(cameraPath));
// 设置系统相机拍摄照片完成后图片文件的存放地址
intent.putExtra(MediaStore.EXTRA_OUTPUT, tempUri);
startActivityForResult(intent, CAMERA_REQUEST_CODE);
} else {
Toast.makeText(MainActivity.this, "请确认已经插入SD卡", Toast.LENGTH_LONG).show();
}
}

/*
* 调用系统相册的方法
*/
public void StartXC() {
/*//调用手机里所有图片
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, ALBUM_REQUEST_CODE);*/
//只调用相册的图片
Intent intent = new Intent(Intent.ACTION_PICK,MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, ALBUM_REQUEST_CODE);
}
/*
* 从相机和系统中获取图片的方法
*/
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) { // 如果返回码是可以用的
switch (requestCode) {
//相册
case ALBUM_REQUEST_CODE:
startPhotoZoom(data.getData()); // 开始对图片进行裁剪处理
break;
//相机
case CAMERA_REQUEST_CODE:
startPhotoZoom(tempUri); // 开始对图片进行裁剪处理
break;
case CROP_SMALL_PICTURE:
if (data != null) {
setImageToView(data); // 让刚才选择裁剪得到的图片显示在界面上
}
break;
}
}
}

/*
* 裁剪图片方法实现
*
* @param uri
*/
protected void startPhotoZoom(Uri uri)

Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
// 设置裁剪（用intent传值通知来做一些系统操作）
intent.putExtra("crop", "true");
// aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// outputX outputY 是裁剪后图片宽高
intent.putExtra("outputX", 150);
intent.putExtra("outputY", 150);
intent.putExtra("return-data", true);
startActivityForResult(intent, CROP_SMALL_PICTURE);
}

/**
* 保存裁剪之后的图片数据
*
* @param
* @param
*/
protected void setImageToView(Intent data) {
//获取Bundle对象的值
Bundle extras = data.getExtras();
if (extras != null) {
Bitmap photo = extras.getParcelable("data");
iv.setImageBitmap(photo);
}
}

}

//SD卡存储的权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
//调用相机的权限
<uses-permission android:name="android.permission.CAMERA" />