014.Bitmap

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="${relativePackage}.${activityClass}" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:src="@drawable/ic_launcher" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <Button
            android:id="@+id/button1"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onClick1"
            android:text="Button" />

        <Button
            android:id="@+id/button2"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onClick2"
            android:text="Button" />

        <Button
            android:id="@+id/button3"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onClick3"
            android:text="Button" />

        <Button
            android:id="@+id/button4"
            style="?android:attr/buttonStyleSmall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onClick4"
            android:text="Button" />

        <Button
            android:id="@+id/button5"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="onClick5"
            android:text="Button" />

    </LinearLayout>

</LinearLayout>

package com.example.app14;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends Activity {

    ImageView imageView;
    Bitmap bitmap;

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

        imageView = (ImageView) findViewById(R.id.imageView1);
        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.a);
        imageView.setImageBitmap(bitmap);// bitmap是唯獨點陣圖
    }

    public void onClick1(View view) {
        Bitmap newBmp = bitmap.copy(Config.ARGB_8888, true);// 放到newBmp就可以改圖
        for (int x = 0; x < newBmp.getWidth(); x++) {
            for (int y = 0; y < newBmp.getHeight(); y++) {
                int c = newBmp.getPixel(x, y);
                int r = Color.red(c);
                int g = Color.green(c);
                int b = Color.blue(c);
                int newColor = Color.argb(255, r, 0, 0);
                newBmp.setPixel(x, y, newColor);
            }
        }
        imageView.setImageBitmap(newBmp);
    }

    public void onClick2(View view) {
        Bitmap newBmp = bitmap.copy(Config.ARGB_8888, true);// 放到newBmp就可以改圖
        for (int x = 0; x < newBmp.getWidth(); x++) {
            for (int y = 0; y < newBmp.getHeight(); y++) {
                int c = newBmp.getPixel(x, y);
                int r = Color.red(c);
                int g = Color.green(c);
                int b = Color.blue(c);
                int gray = (r + g + b) / 3;// 灰階：三個色階都相同
                int newColor = Color.argb(255, gray, gray, gray);

                newBmp.setPixel(x, y, newColor);
            }
        }
        imageView.setImageBitmap(newBmp);
    }

    public void onClick3(View view) {
        Bitmap newBmp = bitmap.copy(Config.ARGB_8888, true);// 放到newBmp就可以改圖
        for (int x = 0; x < newBmp.getWidth(); x++) {
            for (int y = 0; y < newBmp.getHeight(); y++) {
                int c = newBmp.getPixel(x, y);
                int r = 255 - Color.red(c);// 負片效果：與原來的色階相反(0->255)
                int g = 255 - Color.green(c);
                int b = 255 - Color.blue(c);
                int newColor = Color.argb(255, r, g, b);
                newBmp.setPixel(x, y, newColor);
            }
        }
        imageView.setImageBitmap(newBmp);
    }

    public void onClick4(View view) {
        Bitmap newBmp = bitmap.copy(Config.ARGB_8888, true);
        for (int x = 0; x < newBmp.getWidth(); x++) {
            for (int y = 0; y < newBmp.getHeight(); y++) {
                int rgb = newBmp.getPixel(x, y);
                int r = Color.red(rgb);
                int g = Color.green(rgb);
                int b = Color.blue(rgb);
                int newR = (int) (0.393 * r + 0.769 * g + 0.189 * b);// 泛黃效果的公式
                int newG = (int) (0.349 * r + 0.686 * g + 0.168 * b);
                int newB = (int) (0.272 * r + 0.534 * g + 0.131 * b);
                // 三元運算式，newR如果大於255就取255,否則就取原來的newR
                int newColor = Color.argb(255, newR > 255 ? 255 : newR,
                        newG > 255 ? 255 : newG, newB > 255 ? 255 : newB);
                newBmp.setPixel(x, y, newColor);
            }
        }
        imageView.setImageBitmap(newBmp);
    }

    public void onClick5(View view) {
        Bitmap newBmp = bitmap.copy(Config.ARGB_8888, true);
        int x, y;
        x = 100;
        y = 100;
        int newColor = 0;
        for (int dx = x; dx < x + 200; dx++) {
            for (int dy = y; dy < y + 200; dy++) {
                if (dx % 50 == 0 || dy % 50 == 0) {
                    newColor = newBmp.getPixel(dx, dy);
                } else {
                    newBmp.setPixel(dx, dy, newColor);
                }
            }
        }
        imageView.setImageBitmap(newBmp);
    }
}