Android 圖片的合成

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本文實現在Android片的合成

布局設計比較簡單:

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <ImageView        android:id="@+id/iv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        /></RelativeLayout>

邏輯部分代碼如下:

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ImageView iv = (ImageView) findViewById(R.id.iv);        // 圖片合成-畫布 先去畫A 再去畫B        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),                R.drawable.test); // bitmap為唯讀        Bitmap alterBitmap = Bitmap.createBitmap(bitmap.getWidth(),                bitmap.getHeight(), bitmap.getConfig());        Canvas canvas = new Canvas(alterBitmap);        Paint paint = new Paint();        paint.setColor(Color.BLACK);        canvas.drawBitmap(bitmap, new Matrix(), paint);        Bitmap ic_luncher = BitmapFactory.decodeResource(getResources(),                R.drawable.ic_launcher);                canvas.drawBitmap(ic_luncher, new Matrix(), paint);        iv.setImageBitmap(alterBitmap);    }}

最後的效果如下:

開啟android手機的API Demo表徵圖

選擇Graphics,接著選擇Xfermodes,如下:

這裡顯示了各種圖片合成後的模式,我們可以在代碼中實現,這裡採用DARKEN模式,代碼如下:

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ImageView iv = (ImageView) findViewById(R.id.iv);        // 圖片合成-畫布 先去畫A 再去畫B        Bitmap bitmap = BitmapFactory.decodeResource(getResources(),                R.drawable.test); // bitmap為唯讀        Bitmap alterBitmap = Bitmap.createBitmap(bitmap.getWidth(),                bitmap.getHeight(), bitmap.getConfig());        Canvas canvas = new Canvas(alterBitmap);        Paint paint = new Paint();        paint.setColor(Color.BLACK);        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DARKEN));        canvas.drawBitmap(bitmap, new Matrix(), paint);        Bitmap ic_luncher = BitmapFactory.decodeResource(getResources(),                R.drawable.ic_launcher);        canvas.drawBitmap(ic_luncher, new Matrix(), paint);        iv.setImageBitmap(alterBitmap);    }}

效果如下:

Android 圖片的合成

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