[英]Android multitouch?
作為開發人員,我傾向於先編程,然后再進行研究。 我試圖實現一個可以處理多個用戶輸入的屏幕。 基本上不只是一個手指映射。 我嘗試了兩件事......
我有一個實現OnTouchListener的Activity類。 在這里,我有兩個獨立的子視圖,將Activity添加為ontouch偵聽器。 然后我有一個打印出來的事件,打印出event.getPointerCount()並打印出每個指針的位置。
將其下載到手機並進行測試。 我注意到指針從未超過兩個。 我甚至注意到,如果一個手指放在一個孩子身上,另一個手指放在另一個孩子身上,那么事件只會發生在第一個子組件上。 接下來,我嘗試在每個子組件上放置單獨的偵聽器,以查看它是否有效但操作相同。
因此,似乎android在處理來自觸摸屏幕的用戶的輸入時僅支持總共兩個用戶輸入。
這是真的? 從測試和研究看來,情況確實如此。
有沒有人遇到這個限制。 任何聰明的工作?
謝謝你的時間和回應。
DK
支持的觸摸點數取決於設備。 在所有當前可用的Android版本中, MotionEvent
被發送到單個目標視圖並描述所有當前活動的觸摸點的狀態。 目標視圖由第一個MotionEvent.ACTION_DOWN
事件發生的位置確定。
有關在Android上使用多點觸控事件的快速概述,請參閱Android開發者博客上的發布多點觸控感受 。
我寫了一個非常簡單的應用程序來測試我的HTC Incredible手機上的多點觸控。 我表現得非常像我想的那樣,非常像adamp給出的URL。 我的結果是手機只能處理兩個手指輸入。 我有盒子,每個都有自己的OnTouchListener。 當我點擊每個框時,我會為每個框打印一個文本。 點擊每個獲取觸摸事件,但用我的食指我點擊屏幕上的任何地方我有兩個指針。 來自MotionEvent event.getPointerCount方法。 沒關系,第二根手指落在哪里。 可能已經接收到第一個手指向下事件的原始視圖之外。 無論如何,這里是代碼,如果你想自己嘗試。
我有整個項目的7z,但我認為我不能附加它。
所以,這是布局的主要活動和xml。
package com.multitouch;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MultiTouch extends Activity {
protected LinearLayout sq1;
protected LinearLayout sq2;
protected LinearLayout sq3;
protected LinearLayout sq4;
protected String sqText = new String();
protected String sq1Text = new String();
protected String sq2Text = new String();
protected String sq3Text = new String();
private Handler handler = new Handler();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setViews();
handler.postDelayed(mUpdateUITimerTask, 5000);
}
private final Runnable mUpdateUITimerTask = new Runnable() {
public void run() {
// do whatever you want to change here, like:
updateTextField();
}
};
private void updateTextField() {
TextView view1 = (TextView) this.findViewById(R.id.logView);
TextView view2 = (TextView) this.findViewById(R.id.logView1);
TextView view3 = (TextView) this.findViewById(R.id.logView2);
TextView view4 = (TextView) this.findViewById(R.id.logView3);
//view1.append(sqText + "\n");
view1.setText(sqText);
view2.setText(sq1Text);
view3.setText(sq2Text);
view4.setText(sq3Text);
handler.post(mUpdateUITimerTask);
}
private void setViews() {
sq1 = (LinearLayout) this.findViewById(R.id.square1);
sq2 = (LinearLayout) this.findViewById(R.id.square2);
sq3 = (LinearLayout) this.findViewById(R.id.square3);
sq4 = (LinearLayout) this.findViewById(R.id.square4);
sq1.setOnTouchListener(new TouchListener());
sq2.setOnTouchListener(new TouchListener());
sq3.setOnTouchListener(new TouchListener());
sq4.setOnTouchListener(new TouchListener());
}
private class TouchListener implements OnTouchListener {
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getPointerCount()>2) {
sq1Text = "GOT THREE POINTERS!!";
sq2Text = "GOT THREE POINTERS!!";
sq3Text = "GOT THREE POINTERS!!";
sqText = "GOT THREE POINTERS!!";
}
if(event.getAction() == MotionEvent.ACTION_DOWN){
switch(v.getId()) {
case R.id.square1:
sqText = "Square 1 Pressed::Pointer count = " + String.valueOf(event.getPointerCount());
break;
case R.id.square2:
sq1Text = "Square 2 Pressed::Pointer count = " + String.valueOf(event.getPointerCount());
break;
case R.id.square3:
sq2Text = "Square 3 Pressed::Pointer count = " + String.valueOf(event.getPointerCount());
break;
case R.id.square4:
sq3Text = "Square 4 Pressed::Pointer count = " + String.valueOf(event.getPointerCount());
break;
}
} else if(event.getAction() == MotionEvent.ACTION_POINTER_DOWN ||
event.getAction() == MotionEvent.ACTION_POINTER_UP) {
switch(v.getId()) {
case R.id.square1:
sqText = "Square 1 Pointer Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square2:
sq1Text = "Square 2 Pointer Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square3:
sq2Text = "Square 3 Pointer Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square4:
sq3Text = "Square 4 Pointer Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
}
} else if(event.getAction() == MotionEvent.ACTION_POINTER_1_DOWN) {
switch(v.getId()) {
case R.id.square1:
sqText = "Square 1 Pointer1Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square2:
sq1Text = "Square 2 Pointer1Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square3:
sq2Text = "Square 3 Pointer1Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square4:
sq3Text = "Square 4 Pointer1Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
}
} else if(event.getAction() == MotionEvent.ACTION_POINTER_2_DOWN) {
switch(v.getId()) {
case R.id.square1:
sqText = "Square 1 Pointer2Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square2:
sq1Text = "Square 2 Pointer2Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square3:
sq2Text = "Square 3 Pointer2Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square4:
sq3Text = "Square 4 Pointer2Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
}
} else if(event.getAction() == MotionEvent.ACTION_POINTER_3_DOWN) {
switch(v.getId()) {
case R.id.square1:
sqText = "Square 1 Pointer3Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square2:
sq1Text = "Square 2 Pointer3Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square3:
sq2Text = "Square 3 Pointer3Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square4:
sq3Text = "Square 4 Pointer3Down::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
}
} else if(event.getAction() == MotionEvent.ACTION_UP) {
switch(v.getId()) {
case R.id.square1:
sqText = "Square 1 UP::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square2:
sq1Text = "Square 2 UP::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square3:
sq2Text = "Square 3 UP::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square4:
sq3Text = "Square 4 UP::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
}
} else if(event.getAction() == MotionEvent.ACTION_MOVE) {
switch(v.getId()) {
case R.id.square1:
sqText = "Square 1 MOVE::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square2:
sq1Text = "Square 2 MOVE::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square3:
sq2Text = "Square 3 MOVE::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
case R.id.square4:
sq3Text = "Square 4 MOVE::Pointer count = " + String.valueOf(event.getPointerCount()) + "\n";
break;
}
}
// TODO Auto-generated method stub
return true;
}
}
}
布局:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:gravity="center_horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/MainLay" >
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="center_horizontal" android:padding="10dip">
<TableRow android:gravity="center_horizontal" android:padding="10dip">
<LinearLayout android:background="#FFFF00" android:id="@+id/square1" android:padding="10px" android:layout_width="125px" android:layout_height="125px"/>
<LinearLayout android:background="#FF00FF" android:id="@+id/square2" android:padding="10px" android:layout_width="125px" android:layout_height="125px"/>
</TableRow>
<TableRow android:gravity="center_horizontal" android:padding="10dip">
<LinearLayout android:background="#00FFFF" android:id="@+id/square3" android:padding="10px" android:layout_width="125px" android:layout_height="125px"/>
<LinearLayout android:background="#eeeeee" android:id="@+id/square4" android:padding="10px" android:layout_width="125px" android:layout_height="125px"/>
</TableRow>
<TextView android:id="@+id/logView" android:layout_width="wrap_content" android:layout_height="wrap_content"/>
<TextView android:id="@+id/logView1" android:layout_width="wrap_content" android:layout_height="wrap_content"/>
<TextView android:id="@+id/logView2" android:layout_width="wrap_content" android:layout_height="wrap_content"/>
<TextView android:id="@+id/logView3" android:layout_width="wrap_content" android:layout_height="wrap_content"/>
</TableLayout>
</LinearLayout>
祝你好運,如果你嘗試了,請告訴我你是否得到了GOT三個指針! 打印報表。 我想知道什么手機支持它。
謝謝,dk
我編輯了@dakira的答案。 這是我的示例代碼:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/MainLay"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_horizontal"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/tvHeader"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="4dp"
android:text="Place Your Finger on Squire"
android:textColor="#000"
android:textSize="20sp" />
<LinearLayout
android:id="@+id/llStatusHolder"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/tvHeader"
android:orientation="vertical"
android:weightSum="2">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="8dp"
android:weightSum="2">
<TextView
android:id="@+id/tvBox1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#FFFF00"
android:gravity="center"
android:padding="4dp"
android:text="Finger : 0"
android:textColor="#000"
android:textSize="28sp" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/square1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="4dp"
android:layout_below="@+id/llStatusHolder"
android:layout_weight="1"
android:background="#FFFF00"
android:orientation="horizontal"
android:padding="10dp">
</LinearLayout>
</RelativeLayout>
</LinearLayout>
這是JAVA代碼:
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MultiTouchTestActivity extends Activity {
protected LinearLayout sq1;
TextView tvBox1;
int counter1 = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_multi_touch_test);
setViews();
}
private void updateTextField() {
tvBox1.setText("Finger : " + counter1);
}
private void setViews() {
tvBox1 = (TextView) findViewById(R.id.tvBox1);
sq1 = (LinearLayout) this.findViewById(R.id.square1);
sq1.setOnTouchListener(new TouchListener());
}
private class TouchListener implements OnTouchListener {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == 1) {
setCounterValue(1, 0);
}else if (event.getAction() == MotionEvent.ACTION_DOWN) {
setCounterValue(1, event.getPointerCount());
} else if (event.getAction() == MotionEvent.ACTION_POINTER_DOWN ||
event.getAction() == MotionEvent.ACTION_POINTER_UP) {
setCounterValue(1, event.getPointerCount());
} else if (event.getAction() == MotionEvent.ACTION_POINTER_1_DOWN) {
setCounterValue(1, event.getPointerCount());
} else if (event.getAction() == MotionEvent.ACTION_POINTER_2_DOWN) {
setCounterValue(1, event.getPointerCount());
} else if (event.getAction() == MotionEvent.ACTION_POINTER_3_DOWN) {
setCounterValue(1, event.getPointerCount());
} else if (event.getAction() == MotionEvent.ACTION_UP) {
setCounterValue(1, event.getPointerCount());
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
setCounterValue(1, event.getPointerCount());
}else if (event.getAction() == MotionEvent.ACTION_BUTTON_RELEASE) {
setCounterValue(1, 0);
}
updateTextField();
return true;
}
}
void setCounterValue(int hasvalue, int value) {
switch (hasvalue) {
case 1:
counter1 = value;
break;
}
}
}
希望這會解決很多人的問題:)
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