本节引言：
1.代码示例：
运行效果图：
实现代码：
先是一个简单的布局：activity_main.xml：
<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:padding="5dp"
tools:context=".MainActivity">
<ImageView
android:id="@+id/img_meizi"
android:layout_width="300dp"
android:layout_height="300dp"
android:src="@mipmap/img_meizi" />
<EditText
android:id="@+id/edit_mul"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/img_meizi"
android:text="0" />
<EditText
android:id="@+id/edit_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/edit_mul"
android:text="0" />
<Button
android:id="@+id/btn_change"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@id/img_meizi"
android:layout_below="@id/img_meizi"
android:text="变化" />
</RelativeLayout>
接着是我们的MainActiivty.java，同样很简单：
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private ImageView img_meizi;
private EditText edit_mul;
private EditText edit_add;
private Button btn_change;
private Bitmap mBitmap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.img_meizi);
bindViews();
}
private void bindViews() {
img_meizi = (ImageView) findViewById(R.id.img_meizi);
edit_mul = (EditText) findViewById(R.id.edit_mul);
edit_add = (EditText) findViewById(R.id.edit_add);
btn_change = (Button) findViewById(R.id.btn_change);
btn_change.setOnClickListener(this);
}
private Bitmap ProcessImage(Bitmap bp,int mul,int add){
Bitmap bitmap = Bitmap.createBitmap(bp.getWidth(),bp.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColorFilter(new LightingColorFilter(mul,add));
canvas.drawBitmap(bp,0,0,paint);
return bitmap;
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btn_change:
int mul = Integer.parseInt(edit_mul.getText().toString());
int add = Integer.parseInt(edit_add.getText().toString());
img_meizi.setImageBitmap(ProcessImage(mBitmap,mul,add));
break;
}
}
}
好了，LightingColorFilter的使用演示完毕~
3.本节代码下载
LightingColorFilterDemo.zip
