疯狂java讲义笔记 2.3.7

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/layoutMain"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context=".MainActivity" >    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"         android:gravity="center">        <Button            android:id="@+id/upAlpha"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="增大透明度" />        <Button            android:id="@+id/downAlpha"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="降低透明度" />        <Button            android:id="@+id/next"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="下一张" />    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical" >    </LinearLayout>    <ImageView        android:id="@+id/imageView1"        android:layout_width="match_parent"        android:layout_height="400px"        android:background="#0000ff"        android:scaleType="fitCenter"        android:src="@drawable/camera" />    <ImageView        android:id="@+id/imageView2"        android:layout_width="120dp"        android:layout_height="120dp"        android:background="#0000ff"        android:layout_marginTop="10dp"        android:src="@drawable/camera" /></LinearLayout>

package com.moon.hello2;import java.util.Date;import java.util.Timer;import java.util.TimerTask;import com.moon.hello2.R.layout;import android.R.integer;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.os.SystemClock;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.drawable.BitmapDrawable;import android.view.Menu;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnTouchListener;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.widget.Button;import android.widget.Chronometer;import android.widget.Chronometer.OnChronometerTickListener;import android.widget.CompoundButton;import android.widget.CompoundButton.OnCheckedChangeListener;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.ToggleButton;public class MainActivity extends Activity {    int[] images = new int[] { R.drawable.a1, R.drawable.a2, R.drawable.a3,            R.drawable.a4, R.drawable.a5 };    int currentImg = 0;    int alpha = 255;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        this.setContentView(R.layout.activity_main);        final ImageView iView = (ImageView) findViewById(R.id.imageView1);        final ImageView iView2 = (ImageView) findViewById(R.id.imageView2);        final Button btnUpAlpha = (Button) findViewById(R.id.upAlpha);        final Button btnDownAlpha = (Button) findViewById(R.id.downAlpha);        Button btnNext = (Button) findViewById(R.id.next);        iView.setImageResource(images[this.currentImg]);        btnNext.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                // TODO Auto-generated method stub                currentImg++;                if (currentImg >= images.length) {                    currentImg = 0;                }                BitmapDrawable bitmapDrawable = (BitmapDrawable) iView                        .getDrawable();                if (!bitmapDrawable.getBitmap().isRecycled()) {                    bitmapDrawable.getBitmap().recycle();                }                iView.setImageBitmap(BitmapFactory.decodeResource(                        getResources(), images[currentImg]));            }        });        OnClickListener listener = new OnClickListener() {            @Override            public void onClick(View v) {                // TODO Auto-generated method stub                if (v == btnUpAlpha) {                    alpha += 20;                } else if (v == btnDownAlpha) {                    alpha -= 20;                } else {                    ;                }                if (alpha > 255) {                    alpha = 255;                } else if (alpha < 0) {                    alpha = 0;                } else {                    ;                }                iView.setAlpha(alpha);            }        };        btnDownAlpha.setOnClickListener(listener);        btnUpAlpha.setOnClickListener(listener);        iView.setOnTouchListener(new OnTouchListener() {            @Override            public boolean onTouch(View arg0, MotionEvent event) {                // TODO Auto-generated method stub                BitmapDrawable bitmapDrawable = (BitmapDrawable) iView                        .getDrawable();                Bitmap bitmap = bitmapDrawable.getBitmap();                double scale = bitmap.getWidth() / 320.0;                int x = (int) (event.getX() * scale);                int y = (int) (event.getY() * scale);                if(x + 120 > bitmap.getWidth()){                    x = bitmap.getWidth() - 120;                }                if (y + 120 > bitmap.getHeight()) {                    y = bitmap.getHeight() - 120;                }                iView2.setImageBitmap(Bitmap.createBitmap(bitmap,x,y,120,120));                iView2.setAlpha(alpha);                return false;            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

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