求解 android 图片点击一下就放大到全屏，再点一下就回到原界面，这个android源码谁有呢？

发布网友发布时间：2022-05-20 18:13

共3个回答

热心网友时间：2023-11-08 01:07

package com.pic;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.os.Bundle;
import android.view.Display;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.widget.ImageView;

public class TestanroidpicActivity extends Activity {
/** Called when the activity is first created. */
Bitmap bp=null;
ImageView imageview;
float scaleWidth;
float scaleHeight;

int h;
boolean num=false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

Display display=getWindowManager().getDefaultDisplay();
imageview=(ImageView)findViewById(R.id.imageview);
bp=BitmapFactory.decodeResource(getResources(),R.drawable.icon);
int width=bp.getWidth();
int height=bp.getHeight();
int w=display.getWidth();
int h=display.getHeight();
scaleWidth=((float)w)/width;
scaleHeight=((float)h)/height;
imageview.setImageBitmap(bp);
}
@Override
public boolean onTouchEvent(MotionEvent event) {

switch(event.getAction()){

case MotionEvent.ACTION_DOWN:
if(num==true) {
Matrix matrix=new Matrix();
matrix.postScale(scaleWidth,scaleHeight);

Bitmap newBitmap=Bitmap.createBitmap(bp, 0, 0, bp.getWidth(), bp.getHeight(), matrix, true);
imageview.setImageBitmap(newBitmap);
num=false;
}
else{
Matrix matrix=new Matrix();
matrix.postScale(1.0f,1.0f);
Bitmap newBitmap=Bitmap.createBitmap(bp, 0, 0, bp.getWidth(), bp.getHeight(), matrix, true);
imageview.setImageBitmap(newBitmap);
num=true;
}
break;
}

return super.onTouchEvent(event);
}

}

热心网友时间：2023-11-08 01:08

android官网有啊

热心网友时间：2023-11-08 01:08

用ImageView 然后放大，监听touch事件，读出屏幕的分辨率尺寸，然后将读出的尺寸通过参数传到放大的方法中，然后再监听到touch后，还原就可以了。你查下ImageView或者Drawable的放大缩小方法，看看哪个方法的参数有要传上下左右边界的。网上好多这样的例子