您好,登錄后才能下訂單哦!
本篇內(nèi)容介紹了“android怎么實(shí)現(xiàn)多點(diǎn)觸摸應(yīng)用”的有關(guān)知識(shí),在實(shí)際案例的操作過程中,不少人都會(huì)遇到這樣的困境,接下來(lái)就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
JhkMultiTouchActivity.java
package com.android.forlinx; import android.app.Activity; import android.os.Bundle; import android.view.Window; import android.view.WindowManager; public class JhkMultiTouchActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // setContentView(R.layout.main); //隱藏標(biāo)題欄 requestWindowFeature(Window.FEATURE_NO_TITLE); //設(shè)置成全屏 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); //設(shè)置為上面的MTView setContentView(new MTView(this)); } }
MTView.java
package com.android.forlinx; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Typeface; import android.view.MotionEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; public class MTView extends SurfaceView implements SurfaceHolder.Callback { private static final int MAX_TOUCHPOINTS = 10; private static final String START_TEXT = "請(qǐng)隨便觸摸屏幕進(jìn)行測(cè)試"; private Paint textPaint = new Paint(); private Paint touchPaints[] = new Paint[MAX_TOUCHPOINTS]; private int colors[] = new int[MAX_TOUCHPOINTS]; private int width, height; private float scale = 1.0f; public MTView(Context context) { super(context); SurfaceHolder holder = getHolder(); holder.addCallback(this); setFocusable(true); // 確保我們的View能獲得輸入焦點(diǎn) setFocusableInTouchMode(true); // 確保能接收到觸屏事件 init(); } private void init() { // 初始化10個(gè)不同顏色的畫筆 textPaint.setColor(Color.GREEN); textPaint.setTypeface(null); textPaint.setAlpha(200); colors[0] = Color.BLUE; colors[1] = Color.RED; colors[2] = Color.GREEN; colors[3] = Color.YELLOW; colors[4] = Color.CYAN; colors[5] = Color.MAGENTA; colors[6] = Color.DKGRAY; colors[7] = Color.WHITE; colors[8] = Color.LTGRAY; colors[9] = Color.GRAY; for (int i = 0; i < MAX_TOUCHPOINTS; i++) { touchPaints[i] = new Paint(); touchPaints[i].setColor(colors[i]); touchPaints[i].setAlpha(50); } } /* * 處理觸屏事件 */ @Override public boolean onTouchEvent(MotionEvent event) { // 獲得屏幕觸點(diǎn)數(shù)量 int pointerCount = event.getPointerCount(); if (pointerCount > MAX_TOUCHPOINTS) { pointerCount = MAX_TOUCHPOINTS; } // 鎖定Canvas,開始進(jìn)行相應(yīng)的界面處理 Canvas c = getHolder().lockCanvas(); if (c != null) { c.drawColor(Color.BLACK); if (event.getAction() == MotionEvent.ACTION_UP) { // 當(dāng)手離開屏幕時(shí),清屏 } else { // 先在屏幕上畫一個(gè)十字,然后畫一個(gè)圓 for (int i = 0; i < pointerCount; i++) { // 獲取一個(gè)觸點(diǎn)的坐標(biāo),然后開始繪制 int id = event.getPointerId(i); int x = (int) event.getX(i); int y = (int) event.getY(i); drawCrosshairsAndText(x, y, touchPaints[id], i, id, c); } for (int i = 0; i < pointerCount; i++) { int id = event.getPointerId(i); int x = (int) event.getX(i); int y = (int) event.getY(i); drawCircle(x, y, touchPaints[id], c); } } // 畫完后,unlock getHolder().unlockCanvasAndPost(c); } return true; } /** * 畫十字及坐標(biāo)信息 * * @param x * @param y * @param paint * @param ptr * @param id * @param c */ private void drawCrosshairsAndText(int x, int y, Paint paint, int ptr, int id, Canvas c) { c.drawLine(0, y, width, y, paint); c.drawLine(x, 0, x, height, paint); int textY = (int) ((15 + 20 * ptr) * scale); c.drawText("x" + ptr + "=" + x, 10 * scale, textY, textPaint); c.drawText("y" + ptr + "=" + y, 70 * scale, textY, textPaint); c.drawText("id" + ptr + "=" + id, width - 55 * scale, textY, textPaint); } /** * 畫圓 * * @param x * @param y * @param paint * @param c */ private void drawCircle(int x, int y, Paint paint, Canvas c) { c.drawCircle(x, y, 40 * scale, paint); } /* * 進(jìn)入程序時(shí)背景畫成黑色,然后把“START_TEXT”寫到屏幕 */ public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { this.width = width; this.height = height; if (width > height) { this.scale = width / 480f; } else { this.scale = height / 480f; } textPaint.setTextSize(14 * scale); Canvas c = getHolder().lockCanvas(); if (c != null) { // 背景黑色 c.drawColor(Color.BLACK); float tWidth = textPaint.measureText(START_TEXT); c.drawText(START_TEXT, width / 2 - tWidth / 2, height / 2, textPaint); getHolder().unlockCanvasAndPost(c); } } public void surfaceCreated(SurfaceHolder holder) { } public void surfaceDestroyed(SurfaceHolder holder) { } }
效果圖
“android怎么實(shí)現(xiàn)多點(diǎn)觸摸應(yīng)用”的內(nèi)容就介紹到這里了,感謝大家的閱讀。如果想了解更多行業(yè)相關(guān)的知識(shí)可以關(guān)注億速云網(wǎng)站,小編將為大家輸出更多高質(zhì)量的實(shí)用文章!
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。