需要在 android 应用程序中裁剪图像的示例
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need example of cropping an image in android app
提问by dsb
Sorry for the not technical question.
抱歉非技术问题。
I am researching to understand how can I implement a very common feature in android apps where the user can crop a part of an image. This is usually performed using a square window hovering above the shadowed image. A good example is with choosing profile image in the linkedin app. Does anyone know or have good example of how to do it?
我正在研究如何在 android 应用程序中实现一个非常常见的功能，用户可以在其中裁剪图像的一部分。这通常使用悬停在阴影图像上方的方形窗口来执行。一个很好的例子是在linkedin 应用程序中选择个人资料图片。有谁知道或有如何做到这一点的好例子？
Thanks in advance.
提前致谢。
回答by Nishanthi Grashia
Try this:
尝试这个：
1. Manifest XML
1. 清单 XML
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="camera.test.demo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".SimpleCameraGalleryDemo"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
2. Activity Code:
2.活动代码：
-
——
package camera.test.demo;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
public class SimpleCameraGalleryDemo extends Activity {
private static final int PICK_FROM_CAMERA = 1;
private static final int PICK_FROM_GALLERY = 2;
ImageView imgview;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imgview = (ImageView) findViewById(R.id.imageView1);
Button buttonCamera = (Button) findViewById(R.id.btn_take_camera);
Button buttonGallery = (Button) findViewById(R.id.btn_select_gallery);
buttonCamera.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// call android default camera
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT,
MediaStore.Images.Media.EXTERNAL_CONTENT_URI.toString());
// ******** code for crop image
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 0);
intent.putExtra("aspectY", 0);
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 150);
try {
intent.putExtra("return-data", true);
startActivityForResult(intent, PICK_FROM_CAMERA);
} catch (ActivityNotFoundException e) {
// Do nothing for now
}
}
});
buttonGallery.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent();
// call android default gallery
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
// ******** code for crop image
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 0);
intent.putExtra("aspectY", 0);
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 150);
try {
intent.putExtra("return-data", true);
startActivityForResult(Intent.createChooser(intent,
"Complete action using"), PICK_FROM_GALLERY);
} catch (ActivityNotFoundException e) {
// Do nothing for now
}
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PICK_FROM_CAMERA) {
Bundle extras = data.getExtras();
if (extras != null) {
Bitmap photo = extras.getParcelable("data");
imgview.setImageBitmap(photo);
}
}
if (requestCode == PICK_FROM_GALLERY) {
Bundle extras2 = data.getExtras();
if (extras2 != null) {
Bitmap photo = extras2.getParcelable("data");
imgview.setImageBitmap(photo);
}
}
}
}
3. Main.xml
3.主.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" >
<TextView
android:id="@+id/textViewAddCard"
android:layout_width="250dp"
android:layout_height="50dp"
android:text="Take Image"
android:textSize="16dp"
android:layout_gravity="center"
android:gravity="center"
android:typeface="sans"/>
<Button
android:id="@+id/btn_take_camera"
android:layout_width="250dp"
android:layout_height="50dp"
android:text="Take From Camera"
android:layout_marginTop="5dp"
android:layout_gravity="center"
android:typeface="sans"/>
<Button
android:id="@+id/btn_select_gallery"
android:layout_width="250dp"
android:layout_height="50dp"
android:text="Select from Gallery"
android:layout_marginTop="10dp"
android:layout_gravity="center"
android:typeface="sans" />
<ImageView
android:id="@+id/imageView1"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
回答by Javanator
Try the sample method below. Not only you can cut a rectanglebut ANY SHAPEfrom any place in the bitmap you want.
试试下面的示例方法。您不仅可以减少一个矩形，但任何形状在您需要的位图的任何地方。
You can cut a Micky mousefrom the center of bitmap also.
您也可以从位图的中心剪切Micky 鼠标。
The below method is cutting a rectangular bitmap to have pointed triangle on the left side of bitmap. like whatsapp do for thumbnails of images shared in chat.
下面的方法是切割一个矩形位图，在位图的左侧有一个尖角三角形。就像 whatsapp 对聊天中共享的图像缩略图所做的那样。
Anything drawn from the Paint with setXfermode(new PoterDuffXfermode(Mode.CLEAR))will clear the pixels from bitmap.
使用setXfermode(new PoterDuffXfermode(Mode.CLEAR))从 Paint 中绘制的任何内容 都将清除位图中的像素。
Try it out.. Hope this helps :)
试试看..希望这会有所帮助:)
private Bitmap cropAndGivePointedShape(Bitmap originalBitmap)
{
Bitmap bmOverlay = Bitmap.createBitmap(originalBitmap.getWidth(),
originalBitmap.getHeight(),
Bitmap.Config.ARGB_8888);
Paint p = new Paint();
p.setXfermode(new PorterDuffXfermode(Mode.CLEAR));
Canvas canvas = new Canvas(bmOverlay);
canvas.drawBitmap(originalBitmap, 0, 0, null);
canvas.drawRect(0, 0, 20, 20, p);
Point a = new Point(0, 20);
Point b = new Point(20, 20);
Point c = new Point(0, 40);
Path path = new Path();
path.setFillType(FillType.EVEN_ODD);
path.lineTo(b.x, b.y);
path.lineTo(c.x, c.y);
path.lineTo(a.x, a.y);
path.close();
canvas.drawPath(path, p);
a = new Point(0, 40);
b = new Point(0, 60);
c = new Point(20, 60);
path = new Path();
path.setFillType(FillType.EVEN_ODD);
path.lineTo(b.x, b.y);
path.lineTo(c.x, c.y);
path.lineTo(a.x, a.y);
path.close();
canvas.drawPath(path, p);
canvas.drawRect(0, 60, 20, originalBitmap.getHeight(), p);
return bmOverlay;
}
回答by Rajesh Mikkilineni
Try this library:
试试这个库：
https://github.com/biokys/cropimage
https://github.com/biokys/cropimage
For a square:
对于正方形：
intent.putExtra(CropImage.ASPECT_X, 2);
intent.putExtra(CropImage.ASPECT_Y, 2);
For a rectangle:
对于矩形：
intent.putExtra(CropImage.ASPECT_X, 3);
intent.putExtra(CropImage.ASPECT_Y, 2);
