调用摄像头拍照
public class MainActivity extends Activity {
public static final int TAKE_PHOTO = 1;
public static final int CROP_PHOTO = 2;
private Button takePhoto;
private Button chooseFromAlbum;
private ImageView picture;
private Uri imageUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//根据组件ID拿取组件对象
takePhoto = (Button) findViewById(R.id.take_photo);
chooseFromAlbum = (Button) findViewById(R.id.choose_from_album);
picture = (ImageView) findViewById(R.id.picture);
takePhoto.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//创建File对象，用于存储拍照后的照片，存储在了SD卡的根目录下
File outputImage = new File(Environment.getExternalStorageDirectory(),
"output_image.jpg");
try {
if (outputImage.exists()) {
outputImage.delete();
}
outputImage.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
//将File对象转换成Uri对象，标识照片的唯一地址
imageUri = Uri.fromFile(outputImage);
//创建意图对象（照相机启动程序）
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
//指定图片的输出地址
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
//启动照相机程序实现拍照，要求返回值
startActivityForResult(intent, TAKE_PHOTO);
}
});
}
//当启动的程序销毁时，回调此方法
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
//通过请求值来实现不同的逻辑
switch (requestCode) {
case TAKE_PHOTO:
if (resultCode == RESULT_OK) {
//创建意图对象（实现照片剪切功能）
Intent intent = new Intent("com.android.camera.action.CROP");
//设置Intent对象的属性
intent.setDataAndType(imageUri, "image/*");
intent.putExtra("scale", true);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
//启动图片剪切程序，要求返回值
startActivityForResult(intent, CROP_PHOTO);
}
break;
case CROP_PHOTO:
if (resultCode == RESULT_OK) {
try {
//调用BitmapFactory的decodeStream()方法将照片解析成Bitmap对象
Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver()
.openInputStream(imageUri));
//设置到ImageView中显示出来
picture.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
break;
default:
break;
}
}
}
从相册中选择照片
从相册中选择一张照片，然后进行裁剪再存储起来
添加一个按钮，设置点击逻辑
chooseFromAlbum.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//存储图像文件
File outputImage = new File(Environment.getExternalStorageDirectory(),
"output_image.jpg");
try {
if (outputImage.exists()) {
outputImage.delete();
}
outputImage.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
imageUri = Uri.fromFile(outputImage);
Intent intent = new Intent("android.intent.action.GET_CONTENT");
intent.setType("image/*");
intent.putExtra("crop", true);
intent.putExtra("scale", true);
intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
//启动相册程序，要求返回值，传入的请求码是CROP_PHOTO，选中以后可直接实现图像裁剪功能
startActivityForResult(intent, CROP_PHOTO);
}
});
