華容道關鍵點之一出現了，就是處理觸摸，包括手指按下，擡起，移動等。
自己實現一個處理觸摸的類，然後處理
onTouchEvent(MotionEvent event)
事件，在這裏處理手指按下，擡起，移動事件。
代碼爲:
這裏的效果是手指觸摸一下，16塊小圖像依次交換
package com.example.szhrd;
import android.R.bool;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
public class MainActivity extends Activity {
int bit_num = 16;
Bitmap ori_bitmap = null;
img_puzzle puzzles[] = new img_puzzle[bit_num];
int bitmap_width;
int bitmap_height;
int offset_x = 100;
int offset_y = 100;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ori_bitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.koala);
int width = ori_bitmap.getWidth();
int height = ori_bitmap.getHeight();
int new_width = width / 4;
int new_height = height / 4;
Matrix matrix = new Matrix();
matrix.postScale(0.5f, 0.5f);
bitmap_width = new_width / 2;
bitmap_height = new_height / 2;
for (int k = 0; k < bit_num; k++) {
puzzles[k] = new img_puzzle();
}
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
int pos = i * 4 + j;
int x = offset_x + j * bitmap_width;
int y = offset_y + i * bitmap_height;
if (pos == bit_num - 1) {
puzzles[pos].bitmap = Bitmap.createBitmap(new_width, new_height, Config.ARGB_8888);
puzzles[pos].is_blank = true;
} else {
puzzles[pos].bitmap = Bitmap.createBitmap(ori_bitmap,
new_width * j, new_height * i, new_width,
new_height, matrix, true);
}
puzzles[pos].x = puzzles[pos].ori_x = x;
puzzles[pos].y = puzzles[pos].ori_y = y;
}
}
this.setContentView(new DragView(this));
// setContentView(new DragView(this));
}
@Override
protected void onDestroy() {
super.onDestroy();
for (int i = 0; i < bit_num; i++) {
if (null != puzzles[i].bitmap) {
puzzles[i].bitmap.recycle();
puzzles[i].bitmap = null;
}
}
}
private class img_puzzle {
int x;
int y;
int ori_x;
int ori_y;
Bitmap bitmap = null;
boolean is_blank = false;
}
protected void switch_pos() {
int x0 = puzzles[0].x;
int y0 = puzzles[0].y;
for(int i=1;i<bit_num ;i++)
{
int x = puzzles[i].x;
int y=puzzles[i].y;
puzzles[i-1].x = x;
puzzles[i-1].y = y;
}
puzzles[15].x = x0;
puzzles[15].y = y0;
}
private class DragView extends View {
private Paint paint;
public DragView(Context context) {
super(context);
paint = new Paint();
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
// canvas.drawColor(Color.RED);
paint.setStrokeWidth((float) 5.0);
for (int i = 0; i < 4; i++) {
int x = offset_x;
int y = offset_y + bitmap_height * i;
for (int j = 0; j < 4; j++) {
int pos = i * 4 + j;
Bitmap bitmap = puzzles[pos].bitmap;
// int x_1 = offset_x + j*bitmap.getWidth();
// int y_1 = offset_y+i * bitmap.getHeight();
int x_1 = puzzles[pos].x;
int y_1 = puzzles[pos].y;
canvas.drawBitmap(bitmap, x_1, y_1, paint);
canvas.drawLine(x_1, y_1, x_1, y_1 + bitmap_height, paint);
}
canvas.drawLine(x, y, x + bitmap_width * 4, y, paint);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_UP:
switch_pos();
invalidate();
break;
case MotionEvent.ACTION_MOVE:
return true;
default:
}
return true;
}
}
}