原文转自：http://blog.csdn.NET/copy_yuan/article/details/51727070
开源项目地址：https://github.com/Yalantis/uCrop
效果预览
app/build.gradle
compile 'com.yalantis:ucrop:1.5.0'
<activity android:name="com.yalantis.ucrop.UCropActivity"
android:screenOrientation="portrait"
android:theme="@style/Theme.AppCompat.Light.NoActionBar" />
这里theme可以改成自己的
配置uCrop
/**
* 启动裁剪
* @param activity 上下文
* @param sourceFilePath 需要裁剪图片的绝对路径
* @param requestCode 比如：UCrop.REQUEST_CROP
* @param aspectRatioX 裁剪图片宽高比
* @param aspectRatioY 裁剪图片宽高比
* @return
*/
public static String startUCrop(Activity activity, String sourceFilePath,
int requestCode, float aspectRatioX, float aspectRatioY) {
Uri sourceUri = Uri.fromFile(new File(sourceFilePath));
File outDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
if (!outDir.exists()) {
outDir.mkdirs();
}
File outFile = new File(outDir, System.currentTimeMillis() + ".jpg");
//裁剪后图片的绝对路径
String cameraScalePath = outFile.getAbsolutePath();
Uri destinationUri = Uri.fromFile(outFile);
//初始化，第一个参数：需要裁剪的图片；第二个参数：裁剪后图片
UCrop uCrop = UCrop.of(sourceUri, destinationUri);
//初始化UCrop配置
UCrop.Options options = new UCrop.Options();
//设置裁剪图片可操作的手势
options.setAllowedGestures(UCropActivity.SCALE, UCropActivity.ROTATE, UCropActivity.ALL);
//是否隐藏底部容器，默认显示
options.setHideBottomControls(true);
//设置toolbar颜色
options.setToolbarColor(ActivityCompat.getColor(activity, R.color.colorPrimary));
//设置状态栏颜色
options.setStatusBarColor(ActivityCompat.getColor(activity, R.color.colorPrimary));
//是否能调整裁剪框
options.setFreeStyleCropEnabled(true);
//UCrop配置
uCrop.withOptions(options);
//设置裁剪图片的宽高比，比如16：9
uCrop.withAspectRatio(aspectRatioX, aspectRatioY);
//uCrop.useSourceImageAspectRatio();
//跳转裁剪页面
uCrop.start(activity, requestCode);
return cameraScalePath;
}
其他配置
//设置Toolbar标题
void setToolbarTitle(@Nullable String text)
//设置裁剪的图片格式
void setCompressionFormat(@NonNull Bitmap.CompressFormat format)
//设置裁剪的图片质量，取值0-100
void setCompressionQuality(@IntRange(from = 0) int compressQuality)
//设置最多缩放的比例尺
void setMaxScaleMultiplier(@FloatRange(from = 1.0, fromInclusive = false) float maxScaleMultiplier)
//动画时间
void setImageToCropBoundsAnimDuration(@IntRange(from = 100) int durationMillis)
//设置图片压缩最大值
void setMaxBitmapSize(@IntRange(from = 100) int maxBitmapSize)
//是否显示椭圆裁剪框阴影
void setOvalDimmedLayer(boolean isOval)
//设置椭圆裁剪框阴影颜色
void setDimmedLayerColor(@ColorInt int color)
//是否显示裁剪框
void setShowCropFrame(boolean show)
//设置裁剪框边的宽度
void setCropFrameStrokeWidth(@IntRange(from = 0) int width)
//是否显示裁剪框网格
void setShowCropGrid(boolean show)
//设置裁剪框网格颜色
void setCropGridColor(@ColorInt int color)
//设置裁剪框网格宽
void setCropGridStrokeWidth(@IntRange(from = 0) int width)
onActivityResult 获取剪切的图片
经过裁剪，返回结果，这里我一般只需要裁剪后的图片绝对路径（调用上面startUCrop，即返回图片路径），然后调接口上传服务器。
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK && requestCode == UCrop.REQUEST_CROP) {
final Uri resultUri = UCrop.getOutput(data);
} else if (resultCode == UCrop.RESULT_ERROR) {
final Throwable cropError = UCrop.getError(data);
}
}
