本文實例講述了Android編程實現(xiàn)圖片的顏色處理功能。分享給大家供大家參考，具體如下：
先看效果圖：
圖片的顏色處理的基本步驟：
1.先拿到一張原圖
2.拿到一張和原圖一樣的紙
3.把紙固定在畫板上
4.顏色的取值
5.進度條的拖動與監(jiān)聽
代碼編寫：
布局：
<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"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="青--紅" /> <SeekBar android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/red_seekbar"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="青--綠" /> <SeekBar android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/green_seekbar"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="青--藍" /> <SeekBar android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/blue_seekbar"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/im" android:src="@drawable/img_small_1"/></LinearLayout>
activity：
public class MainActivity extends Activity implements OnSeekBarChangeListener{ private SeekBar red_sb,green_sb,blue_sb; private ImageView imageView; private Canvas canvas; private Paint paint; private Bitmap baseBitmap,copyBitmap; private float red_vector,green_vector,blue_vector; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); red_sb=(SeekBar) findViewById(R.id.red_seekbar); green_sb=(SeekBar) findViewById(R.id.green_seekbar); blue_sb=(SeekBar) findViewById(R.id.blue_seekbar); imageView=(ImageView) findViewById(R.id.im); red_sb.setOnSeekBarChangeListener(this); green_sb.setOnSeekBarChangeListener(this); blue_sb.setOnSeekBarChangeListener(this); } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // TODO Auto-generated method stub } @Override public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub int progress=seekBar.getProgress(); float count=progress/50f;//使拖動條的取值為0f-2f,滿足我們的取值要求 switch (seekBar.getId()) { case R.id.red_seekbar: this.red_vector=count; break; case R.id.green_seekbar: this.green_vector=count; break; case R.id.blue_seekbar: this.blue_vector=count; break; default: break; } //主題代碼 baseBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.img_small_1); copyBitmap=Bitmap.createBitmap(baseBitmap.getWidth(), baseBitmap.getHeight(), baseBitmap.getConfig()); canvas=new Canvas(copyBitmap); Matrix matrix=new Matrix(); paint=new Paint(); //vector：取值范圍(0-2) float[] colors=new float[]{ red_vector,0,0,0,0, 0,green_vector,0,0,0, 0,0,blue_vector,0,0, 0,0,0,1,0}; paint.setColorFilter(new ColorMatrixColorFilter(colors)); canvas.drawBitmap(baseBitmap, matrix, paint); imageView.setImageBitmap(copyBitmap); }}希望本文所述對大家Android程序設計有所幫助。
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