/** Called when the activity is first created. */
import android.content.Context;import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.view.KeyEvent;
import android.view.View;
public class Zoom extends View {
private Drawable image;
private int zoomControler=20;
public Zoom(Context context)
{
super(context);
image=context.getResources().getDrawable(R.drawable.icon);
setFocusable(true);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
//here u can control the width and height of the images........ this line is very important
image.setBounds((getWidth()/2)-zoomControler, (getHeight()/2)-zoomControler, (getWidth( )/2)+zoomControler, (getHeight()/2)+zoomControler);
image.draw(canvas);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode==KeyEvent.KEYCODE_DPAD_UP)// zoom in
zoomControler+=10;
if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN) // zoom out
zoomControler-=10;
if(zoomControler<10)
zoomControler=10;
invalidate();
return true;
}
}
package com.min.Test_Gallery;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.Matrix;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.GestureDetector;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.GestureDetector.OnGestureListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.Toast;
public class DisplayImage extends Activity implements OnTouchListener, OnGestureListener {
private static final String TAG ="DisplayImage";
private static final int FLING_MIN_DISTANCE =100;
private static final int FLING_MIN_VELOCITY =200;
/* 相关变量声明 */
private ImageView mImageView;
private Button mButton01;
private Button mButton02;
private FrameLayout layout1;
private LinearLayout layoutImage;
private Bitmap bmp;
private int id=0;
private int displayWidth;
private int displayHeight;
private float scaleWidth=1;
private float scaleHeight=1;
private GestureDetector mGestureDetector;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState);
/* 加载display.xml Layout */
setContentView(https://www.wendangku.net/doc/968010415.html,yout.display);
/* 取得屏幕分辨率大小 */
DisplayMetrics dm=new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
displayWidth=dm.widthPixels;
displayHeight=dm.heightPixels;
/* 初始化相关变量 */
Bundle bundle = this.getIntent().getExtras();
Integer imageId = bundle.getInt("imageId");
Log.i(TAG, "onCreate, imageId = "+ imageId);
bmp=BitmapFactory.decodeResource(getResources(), imageId);
mImageView =(ImageView)findViewById(R.id.myImageView);
mImageView.setImageBitmap(bmp);
mImageView.setOnTouchListener(this);
mImageView.setLongClickable(true);
layout1 =(FrameLayout)findViewById(https://www.wendangku.net/doc/968010415.html,yout1);
layoutImage =(LinearLayout)findViewById(https://www.wendangku.net/doc/968010415.html,youtImage);
mButton01 =(Button)findViewById(R.id.myButton1);
mButton02 =(Button)findViewById(R.id.myButton2);
/* 缩小按钮onClickListener */
mButton01.setOnClickListener(new Button.OnClickListener(){ @Override
public void onClick(View v){
small();
}
});
/* 放大按钮onClickListener */
mButton02.setOnClickListener(new Button.OnClickListener(){ @Override
public void onClick(View v){
big();
}
});
}
// 用户轻触触摸屏,由1个MotionEvent ACTION_DOWN触发
@Override
public boolean onDown(MotionEvent e){
// TODO Auto-generated method stub
// Toast.makeText(this, "onDown", Toast.LENGTH_SHORT).show();
Log.i(TAG, "onDown...");
return false;
}
/* 用户按下触摸屏、快速移动后松开,由1个MotionEvent ACTION_DOWN,
* 多个ACTION_MOVE, 1个ACTION_UP触发
* 参数解释:
* e1:第1个ACTION_DOWN MotionEvent
* e2:最后一个ACTION_MOVE MotionEvent
* velocityX:X轴上的移动速度,像素/秒
* velocityY:Y轴上的移动速度,像素/秒
* 触发条件:
* X轴的坐标位移大于FLING_MIN_DISTANCE,且移动速度大于FLING_MIN_VELOCITY个像素/秒
* @see android.view.GestureDetector$OnGestureListener#onFling(android.vi ew.MotionEvent, android.view.MotionEvent, float, float) */
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY){
// TODO Auto-generated method stub
Log.i(TAG, "onFling...");
if (e1.getX()- e2.getX()> FLING_MIN_DISTANCE
&&Math.abs(velocityX)> FLING_MIN_VELOCITY){ // Fling left
Toast.makeText(this, "Fling Left", Toast.LENGTH_SHORT).show();
} else if (e2.getX()- e1.getX()> FLING_MIN_DISTANCE &&Math.abs(velocityX)> FLING_MIN_VELOCITY){
// Fling right
Toast.makeText(this, "Fling Right", Toast.LENGTH_SHORT).show();
}
return false;
}
// 用户长按触摸屏,由多个MotionEvent ACTION_DOWN触发
@Override
public void onLongPress(MotionEvent e){
// TODO Auto-generated method stub
Log.i(TAG, "onLongPress...");
}
// 用户按下触摸屏,并拖动,由1个MotionEvent ACTION_DOWN, 多个ACTION_MOVE触发
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY){
// TODO Auto-generated method stub
Log.i(TAG, "onScroll...");
return false;
}
// 用户轻触触摸屏,尚未松开或拖动,由一个1个MotionEvent ACTION_DOWN 触发
// 注意和onDown()的区别,强调的是没有松开或者拖动的状态
@Override
public void onShowPress(MotionEvent e){
// TODO Auto-generated method stub
Log.i(TAG, "onShowPress...");
}
// 用户(轻触触摸屏后)松开,由一个1个MotionEvent ACTION_UP触发@Override
public boolean onSingleTapUp(MotionEvent e){
// TODO Auto-generated method stub
Log.i(TAG, "onSingleTapUp...");
return false;
}
@Override
public boolean onTouch(View v, MotionEvent event){ // TODO Auto-generated method stub
Log.i(TAG, "onTouch...");
// Set button visible
mButton01.setVisibility(View.VISIBLE);
mButton02.setVisibility(View.VISIBLE);
return mGestureDetector.onTouchEvent(event);
}
// @Override
// public boolean onTouchEvent(MotionEvent event) {
// // TODO Auto-generated method stub
// super.onTouchEvent(event);
//
// Log.i(TAG, "onTouchEvent");
// // Set button visible
// mButton01.setVisibility(View.VISIBLE);
// mButton02.setVisibility(View.VISIBLE);
//
// return true;
// }
@Override
public boolean onKeyDown(int keyCode, KeyEvent event){ // TODO Auto-generated method stub
super.onKeyDown(keyCode, event);
Log.i(TAG, "onKeyDown...");
// Set button visible
mButton01.setVisibility(View.VISIBLE);
mButton02.setVisibility(View.VISIBLE);
return true;
}
/* 图片缩小的method */
private void small(){
int bmpWidth=bmp.getWidth();
int bmpHeight=bmp.getHeight();
Log.i(TAG, "bmpWidth = "+bmpWidth +", bmpHeight = "+ bmpHeight);
/* 设置图片缩小的比例 */
double scale=0.8;
/* 计算出这次要缩小的比例 */
scaleWidth=(float)(scaleWidth*scale);
scaleHeight=(float)(scaleHeight*scale);
/* 产生reSize后的Bitmap对象 */
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
Bitmap resizeBmp = Bitmap.createBitmap(bmp,0,0,bmpWidth, bmpHeight,matrix,true);
if(id==0){
/* 如果是第一次按,就删除原来默认的ImageView */
layoutImage.removeView(mImageView);
} else {
/* 如果不是第一次按,就删除上次放大缩小所产生的ImageView */
layoutImage.removeView((ImageView)findViewById(id));
}
/* 产生新的ImageView,放入reSize的Bitmap对象,再放入Layout中 */
id++;
ImageView imageView = new ImageView(this);
imageView.setId(id);
imageView.setImageBitmap(resizeBmp);
layoutImage.addView(imageView);
Log.i(TAG, "imageView.getWidth() = "+ imageView.getWidth() +", imageView.getHeight() = "+imageView.getHeight());
setContentView(layout1);
/* 因为图片放到最大时放大按钮会disable,所以在缩小时把它重设为enable
*/
mButton02.setEnabled(true);
mButton02.setTextColor(Color.MAGENTA);
}
/* 图片放大的method */
private void big(){
int bmpWidth=bmp.getWidth();
int bmpHeight=bmp.getHeight();
Log.i(TAG, "bmpWidth = "+bmpWidth +", bmpHeight = "+ bmpHeight);
/* 设置图片放大的比例 */
double scale=1.25;
/* 计算这次要放大的比例 */
scaleWidth=(float)(scaleWidth*scale);
scaleHeight=(float)(scaleHeight*scale);
/* 产生reSize后的Bitmap对象 */
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
Bitmap resizeBmp = Bitmap.createBitmap(bmp,0,0,bmpWidth, bmpHeight,matrix,true);
if(id==0){
/* 如果是第一次按,就删除原来设置的ImageView */
layoutImage.removeView(mImageView);
} else {
/* 如果不是第一次按,就删除上次放大缩小所产生的ImageView */
layoutImage.removeView((ImageView)findViewById(id));
}
/* 产生新的ImageView,放入reSize的Bitmap对象,再放入Layout中 */
id++;
ImageView imageView = new ImageView(this);
imageView.setId(id);
imageView.setImageBitmap(resizeBmp);
layoutImage.addView(imageView);
setContentView(layout1);
/* 如果再放大会超过屏幕大小,就把Button disable */
if( scaleWidth * scale * bmpWidth > bmpWidth *3||
scaleHeight * scale * bmpHeight > bmpWidth *3||
scaleWidth * scale * bmpWidth > displayWidth *5||
scaleHeight * scale * bmpHeight > displayHeight *5){
mButton02.setEnabled(false);
mButton02.setTextColor(Color.GRAY);
} else {
mButton02.setEnabled(true);
mButton02.setTextColor(Color.MAGENTA);
}
}
}
文件
version="1.0"encoding="utf-8"?>
="https://www.wendangku.net/doc/968010415.html,/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/layout1"
>
="https://www.wendangku.net/doc/968010415.html,/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="19"
android:scrollbars="vertical"
android:fadingEdge="vertical">
android:layout_height="fill_parent"
android:layout_width="wrap_content">
="https://www.wendangku.net/doc/968010415.html,/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:id="@+id/layoutImage"
>
android:id="@+id/myImageView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="19"
android:paddingTop="5dip"
android:paddingBottom="5dip"
="https://www.wendangku.net/doc/968010415.html,/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>