Android Zoom Gallery 帮助

Question

我真的需要帮助。 我有一个漫画书类型的独立应用程序。使用 onfling 手势来回翻转图像 然而，我迫切需要能够缩放每个图像/面板。 这是一个扩展画廊： 请帮助我向此代码添加缩放功能！ 谢谢 请不要让我参考 stackoverflow 上已经发布的内容，我已经阅读了所有内容，但到目前为止它对我没有帮助......

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.res.TypedArray;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery.LayoutParams;
import android.widget.ImageView;
import android.widget.Toast;
@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

         mygallery gallery = (mygallery) findViewById(R.id.thisgallery);

         gallery.setAdapter(new AddImgAdp(this));

         gallery.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

                Toast.makeText(main.this, "Page " + position, Toast.LENGTH_SHORT).show();
            }

        });

    }

    public class AddImgAdp extends BaseAdapter {
        int GalItemBg;
        private Context cont;


        private Integer[] Imgid = {
                R.drawable.s1,
                R.drawable.s1a,
                R.drawable.s1b,
                R.drawable.s1b1,
                R.drawable.s1b2,
                R.drawable.s1b3,
                R.drawable.s1c,
                R.drawable.s1s,
                R.drawable.s2,
                R.drawable.s3,
                R.drawable.s4,
                R.drawable.s5,
                R.drawable.s6,
                R.drawable.s7,
                R.drawable.s8,
                R.drawable.s9,
                R.drawable.s10,
                R.drawable.s11,
                R.drawable.s12,
                R.drawable.s13,
                R.drawable.s14,
                R.drawable.s15,
                R.drawable.s16,
                R.drawable.s17,
                R.drawable.s18,
                R.drawable.s19,
                R.drawable.s20,
                R.drawable.s21,
                R.drawable.s22,
                R.drawable.s23,
                R.drawable.s24,
                R.drawable.s25,
                R.drawable.s26,
                R.drawable.s27,
                R.drawable.s28,
                R.drawable.s29,
                R.drawable.s30,
                R.drawable.s31,
                R.drawable.s32,
                R.drawable.s33,
                R.drawable.s34,
                R.drawable.s35,
                R.drawable.s36,
                R.drawable.s37,
                R.drawable.s38,
                R.drawable.s39,
                R.drawable.s40,
                R.drawable.s41,
                R.drawable.s42,
                R.drawable.s43,
                R.drawable.s44,
                R.drawable.s45,
                R.drawable.s46,
                R.drawable.s47,
                R.drawable.s48,
                R.drawable.s49,
                R.drawable.s50,
                R.drawable.s51,
                R.drawable.s52,
                R.drawable.s53,
                R.drawable.s54,
                R.drawable.s55,
                R.drawable.s56,
                R.drawable.s57,
                R.drawable.s58,
                R.drawable.s59,
                R.drawable.s60,
                R.drawable.s61,
                R.drawable.s62,
                R.drawable.s63,
                R.drawable.s64,
                R.drawable.s65,
                R.drawable.s66,
                R.drawable.s67,
                R.drawable.s68,
                R.drawable.s69,
                R.drawable.s70,
                R.drawable.s71,
                R.drawable.s72,
                R.drawable.s73,
                R.drawable.s74,
                R.drawable.s75,
                R.drawable.s76,
                R.drawable.s77,
                R.drawable.s78,
                R.drawable.s79,
                R.drawable.s80,
                R.drawable.s81,
                R.drawable.s82,
                R.drawable.s83,
                R.drawable.s84,
                R.drawable.s85,
                R.drawable.s86,
                R.drawable.s87,
                R.drawable.s88,
                R.drawable.s89,
                R.drawable.s90,
                R.drawable.s91,
                R.drawable.s92,
                R.drawable.s93,
                R.drawable.s94,
                R.drawable.s95,
                R.drawable.s96,
                R.drawable.s97,
                R.drawable.s98,
                R.drawable.s99,
                R.drawable.s100,
                R.drawable.s101,
                R.drawable.s102,
                R.drawable.s103,
                R.drawable.s104,
                R.drawable.s105,
                R.drawable.s106,
                R.drawable.s107,
                R.drawable.s108,
                R.drawable.s109,
                R.drawable.s110,
                R.drawable.s111,
                R.drawable.s112,
                R.drawable.s113,
                R.drawable.s114,
                R.drawable.s115,
                R.drawable.s116,
                R.drawable.s117,
                R.drawable.s118,
                R.drawable.s119,
                R.drawable.s120,
                R.drawable.s121,
                R.drawable.s122,
                R.drawable.s123,
                R.drawable.s124,
                R.drawable.s125,
                R.drawable.s126,
                R.drawable.s127,
                R.drawable.s128,
                R.drawable.s129,
                R.drawable.s130,
                R.drawable.s131,
                R.drawable.s132,
                R.drawable.s133,
                R.drawable.s134,
                R.drawable.s135,
                R.drawable.s136,
                R.drawable.s137,
                R.drawable.s138,
                R.drawable.s139,
                R.drawable.s140,
                R.drawable.s141,
                R.drawable.s142,
                R.drawable.s143,
                R.drawable.s144,
                R.drawable.s145,
                R.drawable.s146,
                R.drawable.s147,
                R.drawable.s148};

        public AddImgAdp(Context c) {
            cont = c;
            TypedArray typArray = obtainStyledAttributes(R.styleable.Gallery1);
            GalItemBg = typArray.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
            typArray.recycle();
        }

        public int getCount() {
            return Imgid.length;
        }

        public Object getItem(int position) {
            return position;
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView imgView = new ImageView(cont);

            imgView.setImageResource(Imgid[position]);

            imgView.setScaleType(ImageView.ScaleType.FIT_XY);
            imgView.setBackgroundResource(0x0106000d);
            imgView.setLayoutParams(new mygallery.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

            return imgView;
        }
    }
}

以及 onfling 覆盖：

import android.content.Context;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.widget.Gallery;




public class mygallery extends Gallery {

    public mygallery(Context ctx, AttributeSet attrSet) {
        super(ctx, attrSet);
        // TODO Auto-generated constructor stub
    }

    private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2){ 
           return e2.getX() > e1.getX(); 
        }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY){
      int kEvent;
      if(isScrollingLeft(e1, e2)){ //Check if scrolling left
        kEvent = KeyEvent.KEYCODE_DPAD_LEFT;
      }
      else{ //Otherwise scrolling right
        kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;
      }
      onKeyDown(kEvent, null);
      return true;  
    }

}

Answer 1

可以使用android的ScaleAnimation类来实现缩放效果。但问题是，动画实际上不会改变它所应用的视图的大小/位置，这是一个很大的问题，因为应用动画的视图的点击区域将始终保持不变，并且很快。然而，没有其他方法可以实现缩放效果 AFAIK。（至少在 3.0 之前的 android 版本中）。