華容道關鍵點之一出現了，就是處理觸摸，包括手指按下，抬起，移動等。

自己實現一個處理觸摸的類，然后處理

onTouchEvent(MotionEvent event)

事件，在這里處理手指按下，抬起，移動事件。

代碼為:

這里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;

? }

?}

}

?

下一步

Android華容道之一步一步實現-4-圖像塊移動算法

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