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;

    }



}