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android - 在 android 中 move 、缩放和裁剪图像,如 facebook 个人资料图片

转载 作者:塔克拉玛干 更新时间:2023-11-02 20:08:34 34 4
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我想在我的应用程序中裁剪图像。我尝试了很多但没有成功。它对 android 开发人员的挑战。是否有任何想法或引用来实现在 android 中 move 、缩放和裁剪图像的功能,如 facebook 上传个人资料图片。现在我可以 move 、缩放和裁剪图像。但不像 facebook 那样一致。我想根据方向设置固定图像比例。我附上了屏幕截图 3。

我的代码如下:-

crop_image.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >

<FrameLayout
android:id="@+id/flCrop"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="1" >

<ImageView
android:id="@+id/img"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:scaleType="matrix"
android:src="@drawable/nature" />

<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:scaleType="fitXY"
android:src="@drawable/blur_with_frame"
android:visibility="visible" />

<ImageView
android:id="@+id/troll_face"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="10dp"
android:layout_gravity="bottom" />
</FrameLayout>

<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="btnSelectPic"
android:layout_marginRight="10dp"
android:text="select Pic" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:onClick="btnCrop"
android:text="Crop" />
</LinearLayout>

</LinearLayout>

主 Activity .java

package com.hotveryspicy.maskimage;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.net.Uri;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

import com.ipaulpro.afilechooser.utils.FileUtils;

public class MainActivity extends Activity implements OnTouchListener{
ImageView img;
FrameLayout flCrop;

int framWidth = 0;
int framHeight = 0;

int imageHeight ;
int imageWidth ;

int cropImageWidth = 320;
int cropImageHeight = 263;

public static int SELECT_PHOTO =0;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.crop_image);
img = (ImageView) findViewById(R.id.img);
flCrop = (FrameLayout) findViewById(R.id.flCrop);
img.setOnTouchListener(this);


}

public void btnCrop(View v) {
ImageView troll_face = (ImageView) findViewById(R.id.troll_face);
makeMaskImage(troll_face, R.drawable.nature);
}

public void btnSelectPic(View v){
Intent intent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 0);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);

switch (resultCode) {
case RESULT_OK:
Uri targetUri = data.getData();

final String path = FileUtils.getPath(this, targetUri);

BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;

Bitmap bitmap = null;
try {

bitmap = BitmapFactory
.decodeFile(path);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
imageHeight = options.outHeight;
imageWidth = options.outWidth;

img.setOnTouchListener(MainActivity.this);

img.setImageBitmap(bitmap);

break;
}
}

// Method of creating mask runtime
public void makeMaskImage(ImageView mImageView, int mContent) {

flCrop.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(flCrop.getDrawingCache());
flCrop.setDrawingCacheEnabled(false);

Log.e("TEST", "Frame W : " + framWidth + " H : " + framHeight);
Log.e("TEST",
"Bitmap W : " + bitmap.getWidth() + " H : "
+ bitmap.getHeight());

Bitmap result = Bitmap.createBitmap(bitmap, (framWidth / 2)
- (cropImageWidth / 2) +1, (framHeight / 2)
- (cropImageHeight / 2), cropImageWidth -2, cropImageHeight);
mImageView.setImageBitmap(result);
mImageView.setScaleType(ScaleType.CENTER);
// mImageView.setBackgroundResource(R.drawable.frame);
}





@Override
public boolean onTouch(View v, MotionEvent event) {
// handle touch events here
ImageView view = (ImageView) v;
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
savedMatrix.set(matrix);
start.set(event.getX(), event.getY());
mode = DRAG;
lastEvent = null;
break;
case MotionEvent.ACTION_POINTER_DOWN:
oldDist = spacing(event);
if (oldDist > 10f) {
savedMatrix.set(matrix);
midPoint(mid, event);
mode = ZOOM;
}
lastEvent = new float[4];
lastEvent[0] = event.getX(0);
lastEvent[1] = event.getX(1);
lastEvent[2] = event.getY(0);
lastEvent[3] = event.getY(1);
d = rotation(event);
Log.e("MainActivity","MainActivity down d = "+d);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_POINTER_UP:
mode = NONE;
lastEvent = null;
break;
case MotionEvent.ACTION_MOVE:
if (mode == DRAG) {
matrix.set(savedMatrix);
float dx = event.getX() - start.x;
float dy = event.getY() - start.y;
Log.e("TEST","Dx : "+ dx+" Dy : "+ dy);
matrix.postTranslate(dx, dy);
} else if (mode == ZOOM) {
float newDist = spacing(event);
if (newDist > 10f) {
matrix.set(savedMatrix);
float scale = (newDist / oldDist);
matrix.postScale(scale, scale, mid.x, mid.y);
}
if (lastEvent != null && event.getPointerCount() == 3) {
newRot = rotation(event);
Log.e("MainActivity","MainActivity move d= "+d);
float r = newRot - d;
float[] values = new float[9];
matrix.getValues(values);
float tx = values[2];
float ty = values[5];
float sx = values[0];
float xc = (view.getWidth() / 2) * sx;
float yc = (view.getHeight() / 2) * sx;
matrix.postRotate(r, tx + xc, ty + yc);
}
}
break;
default:
view.setImageMatrix(matrix);
return true;
}
view.setImageMatrix(matrix);
return true;
}

/**
* Determine the space between the first two fingers
*/
private float spacing(MotionEvent event) {
float x = event.getX(0) - event.getX(1);
float y = event.getY(0) - event.getY(1);
return FloatMath.sqrt(x * x + y * y);
}

/**
* Calculate the mid point of the first two fingers
*/
private void midPoint(PointF point, MotionEvent event) {
float x = event.getX(0) + event.getX(1);
float y = event.getY(0) + event.getY(1);
point.set(x / 2, y / 2);
}

/**
* Calculate the degree to be rotated by.
*
* @param event
* @return Degrees
*/
private float rotation(MotionEvent event) {
double delta_x = (event.getX(0) - event.getX(1));
double delta_y = (event.getY(0) - event.getY(1));
double radians = Math.atan2(delta_y, delta_x);
return (float) Math.toDegrees(radians);
}
// these matrices will be used to move and zoom image
private static Matrix matrix = new Matrix();
private static Matrix savedMatrix = new Matrix();
// we can be in one of these 3 states
private static final int NONE = 0;
private static final int DRAG = 1;
private static final int ZOOM = 2;
private int mode = NONE;
// remember some things for zooming
private PointF start = new PointF();
private PointF mid = new PointF();
private float oldDist = 1f;
private float d = 0f;
private float newRot = 0f;
private float[] lastEvent = null;

boolean flag ;
}

看我的演示:-

截图1 Screenshot-1

当缩小时,它看起来如下图:-截图2 Screenshot-2

我到底在寻找什么解决方案:-截图-3

Screenshot-3

如果有人有想法。请帮助我。在此先感谢...

最佳答案

我也有类似的需求。使用修改后的 Photoview 和 Cropper 库创建裁剪组件。用户可以从图库中选择图片或从相机中拍照,然后通过 move 和缩放裁剪图像,类似于 Facebook 个人资料图片裁剪。在github上分享项目。

请查看这里的github项目: https://github.com/ozeetee/AndroidImageZoomCrop

关于android - 在 android 中 move 、缩放和裁剪图像,如 facebook 个人资料图片,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/22914935/

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