UI复习-组件:ImageView(图片缩放)

package com.brady.est;

import android.annotation.SuppressLint;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

@SuppressLint({ "HandlerLeak", "ClickableViewAccessibility" })
public class MainActivity extends ActionBarActivity {

private int[] images = new int[]{R.drawable.a,R.drawable.b,R.drawable.c,R.drawable.d};
int currentImage = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

final Button button = (Button)findViewById(R.id.button);
final ImageView imageView1 = (ImageView)findViewById(R.id.image1);
final ImageView imageView2 = (ImageView)findViewById(R.id.image2);
final TextView detail = (TextView)findViewById(R.id.detail);

button.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
imageView1.setImageResource(images[currentImage%images.length]);
currentImage++;
}
});

imageView1.setOnTouchListener(new OnTouchListener() {

@Override
public boolean onTouch(View v, MotionEvent event) {

BitmapDrawable bitmapDrawable =  (BitmapDrawable)imageView1.getDrawable();
Bitmap bitmap = bitmapDrawable.getBitmap();

//缩放比例
double scale = bitmap.getWidth()/imageView1.getWidth();

int x = (int)(event.getX()*scale);
int y = (int)(event.getY()*scale);
if(x+150>bitmap.getWidth()){
x = bitmap.getWidth()-150;
}

if(y+100>bitmap.getHeight()){
y = bitmap.getHeight()-150;
}
detail.setText(scale+"\n"+"x:"+x+"\n"+bitmap.getWidth()+"\n"+"y:"+y+"\n"+bitmap.getHeight());
imageView2.setImageBitmap(Bitmap.createBitmap(bitmap, x, y, 100, 100));

return false;
}
});

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/root"
android:padding="5dip"
tools:context="com.brady.est.MainActivity" >

<ImageView
android:id="@+id/image1"
android:layout_width="200px"
android:layout_height="wrap_content"
android:src="@drawable/a"/>
<Button
android:id="@+id/button"
android:text="下一张"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<ImageView
android:id="@+id/image2"
android:layout_width="120px"
android:layout_height="wrap_content"
/>
<TextView
android:id="@+id/detail"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

</LinearLayout>