如何在android中模拟放大或缩小事件

如何在android中模拟放大和缩小事件？它需要存在于服务中，并在任何android AP中启动。

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例如：在图像相关AP和图像执行放大和缩小事件中。当服务启动放大或缩小事件时，图像将执行它所执行的操作。非常感谢。

放大和缩小图像非常容易。看看这里 使用上下箭头键，u可以放大和缩小图像

zooming.java

import android.app.Activity;
import android.os.Bundle;

public class zooming extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(new Zoom(this));
    }
}

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;
        }
}

Zoom.java

import android.app.Activity;
import android.os.Bundle;

public class zooming extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(new Zoom(this));
    }
}

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;
        }
}

导入android.content.Context；
导入android.graphics.Canvas；
导入android.graphics.drawable.drawable；
导入android.view.KeyEvent；
导入android.view.view；
公共类缩放扩展视图{
私有可绘制图像；
专用int ZoomController=20；
公共缩放（上下文）
{
超级（上下文）；
image=context.getResources（）.getDrawable（R.drawable.icon）；
设置聚焦（真）；
}
@凌驾
受保护的void onDraw（画布）{
//TODO自动生成的方法存根
super.onDraw（帆布）；
//这里你可以控制图像的宽度和高度……这条线非常重要
setBounds（（getWidth（）/2）-ZoomController，（getHeight（）/2）-ZoomController，（getWidth（）/2）+ZoomController，（getHeight（）/2）+ZoomController；
图像绘制（画布）；
}
@凌驾
公共布尔onKeyDown（int-keyCode，KeyEvent事件）{
if（keyCode==KeyEvent.keyCode\u DPAD\u UP）//放大
ZoomController+=10；
if（keyCode==KeyEvent.keyCode\u DPAD\u DOWN）//缩小
ZoomController-=10；
如果（ZoomController可以很容易地放大和缩小图像。请看这里
使用上下箭头键，u可以放大和缩小图像

zooming.java

import android.app.Activity;
import android.os.Bundle;

public class zooming extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(new Zoom(this));
    }
}

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;
        }
}

Zoom.java

import android.app.Activity;
import android.os.Bundle;

public class zooming extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(new Zoom(this));
    }
}

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;
        }
}

导入android.content.Context；
导入android.graphics.Canvas；
导入android.graphics.drawable.drawable；
导入android.view.KeyEvent；
导入android.view.view；
公共类缩放扩展视图{
私有可绘制图像；
专用int ZoomController=20；
公共缩放（上下文）
{
超级（上下文）；
image=context.getResources（）.getDrawable（R.drawable.icon）；
设置聚焦（真）；
}
@凌驾
受保护的void onDraw（画布）{
//TODO自动生成的方法存根
super.onDraw（帆布）；
//这里你可以控制图像的宽度和高度……这条线非常重要
setBounds（（getWidth（）/2）-ZoomController，（getHeight（）/2）-ZoomController，（getWidth（）/2）+ZoomController，（getHeight（）/2）+ZoomController；
图像绘制（画布）；
}
@凌驾
公共布尔onKeyDown（int-keyCode，KeyEvent事件）{
if（keyCode==KeyEvent.keyCode\u DPAD\u UP）//放大
ZoomController+=10；
if（keyCode==KeyEvent.keyCode\u DPAD\u DOWN）//缩小
ZoomController-=10；
如果（ZoomControl），如果你发现你的问题有用，你应该接受答案（请看那里有一个勾号），并使用UpVots。这将帮助你获得更多答案。此外，如果你发现你的问题有用，你应该接受答案（请看那里有一个勾号），并使用UpVots。这将帮助你获得更多答案。