获取Android上触摸事件的坐标

I'm new to Android, I've followed the hello world tutorial through and have a basic idea of what's going on. I'm particularly interested in the touch screen of my T-Mobile Pulse so just to get me started I want to be able to write the co-ordinates of a tocuh event on the screen, so say the user touched the co-ordinate 5,2 - a textview on the screen would display that.

我是Android新手,我已经按照hello world教程进行了操作,并对所发生的事情有了基本的了解。我对T-Mobile Pulse的触摸屏特别感兴趣,所以为了让我开始,我希望能够在屏幕上写出tocuh事件的坐标,所以说用户触摸了坐标5 ,2 - 屏幕上的文本视图将显示该内容。

At present I have a simple program that just loads an xml file which contains the textview I intend to write the co-ordinates in.

目前我有一个简单的程序,只是加载一个xml文件,其中包含我打算编写坐标的textview。

Thank you in advance, I did Google for help and searched * but everything I found either went way over my head or wasn't suitable for this. Cheers.

提前谢谢你,我向谷歌寻求帮助并搜索了*,但我找到的所有内容都超出了我的想法,或者不适合这个。干杯。

4 个解决方案

#1

You can use this function : http://developer.android.com/reference/android/view/View.html#setOnTouchListener(android.view.View.OnTouchListener)

您可以使用此功能:http://developer.android.com/reference/android/view/View.html#setOnTouchListener(android.view.View.OnTouchListener)

You will probably put it in your onCreate method roughly this way (tested this time) :

你可能会大致以这种方式将它放在你的onCreate方法中(这次测试):

Activity onCreate code

活动onCreate代码

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    final TextView textView = (TextView)findViewById(R.id.textView);
    // this is the view on which you will listen for touch events
    final View touchView = findViewById(R.id.touchView);
    touchView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Touch coordinates : " +
                String.valueOf(event.getX()) + "x" + String.valueOf(event.getY()));
                return true;
        }
    });
}

layout code

<?xml version="1.0" encoding="utf-8"?>                                      
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:id="@+id/touchView" 
    android:background="#f00" 
    android:layout_weight="1" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView  
    android:id="@+id/textView" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Hello World, TestActivity"
    />
</LinearLayout>

Edit: I tried my code and indeed there were a few errors. Anyway, with the layout I give you here it works on my emulator. Can you provide maybe more code/context so I can see what's wrong?

编辑:我尝试了我的代码,确实有一些错误。无论如何,我给你的布局在我的模拟器上工作。你能提供更多的代码/上下文,这样我就可以看出出了什么问题吗?

#2

It sounds like you want to get touch events from the whole area of your layout for this particular test. Try attaching the touch listener to your parent view rather than a separate target view.

听起来您希望从布局的整个区域获取针对此特定测试的触摸事件。尝试将触摸侦听器附加到父视图而不是单独的目标视图。

This isn't a very common approach. In most cases you will want to listen for touch events in a specific child view and if you have other views in your layout that handle touch events (such as a button) they'll take priority over a parent view. See http://developer.android.com/guide/topics/ui/ui-events.html for more info about handling UI events.

这不是一种非常常见的方法。在大多数情况下,您将希望在特定子视图中侦听触摸事件,如果您的布局中有其他视图处理触摸事件(例如按钮),则它们将优先于父视图。有关处理UI事件的详细信息,请参阅http://developer.android.com/guide/topics/ui/ui-events.html。

Layout (touch_viewer.xml):

<?xml version="1.0" encoding="utf-8" ?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:id="@+id/parent" >
    <TextView android:id="@+id/text"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Hello, World!" />
</LinearLayout>

And in your activity:

在你的活动中:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.touch_viewer);

    final LinearLayout parent = (LinearLayout) findViewById(R.id.parent);
    final TextView text = (TextView) findViewById(R.id.text);
    parent.setOnTouchListener(new OnTouchListener() {
        public boolean onTouch(View v, MotionEvent ev) {
            text.setText("Touch at " + ev.getX() + ", " + ev.getY());
            return true;
        }
    });
}

#3

The following works using a touch screen on the jetboy sample android app. Joes code worked with one tweak to make it shine the background thru. The only line I added was

以下工作使用jetboy示例Android应用程序上的触摸屏。 Joes代码使用一个调整来使它通过背景照亮。我添加的唯一一条线是

android:background="#0000"
android:layout_height="fill_parent"   
android:layout_height="fill_parent" 

Thanks Joe (above).

谢谢乔(上图)。

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    final TextView textView = (TextView)findViewById(R.id.textView);
    // this is the view on which you will listen for touch events
    final View touchView = findViewById(R.id.touchView);
    touchView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Touch coordinates : " +
                String.valueOf(event.getX()) + "x" + String.valueOf(event.getY()));
                return true;
        }
    });
}

layout code

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <com.android.samples.jetboy.JetBoyView android:id="@+id/JetBoyView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
        <TextView  
                android:id="@+id/touchView" 
                android:background="#0000" 
                android:layout_weight="1" 
                android:layout_width="fill_parent" 
                android:layout_height="fill_parent" 
        />
        <TextView  
                android:id="@+id/textView" 
                android:layout_width="fill_parent" 
                android:layout_height="fill_parent" 
                android:text="Hello World, TestActivity"
        />
</FrameLayout>

#4

The corrected version without the errors:

没有错误的更正版本:

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final TextView textView = (TextView) findViewById(R.id.textView);
        // this is the view on which you will listen for touch events
        final View touchView = findViewById(R.id.touchView);
        touchView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                textView.setText("Touch coordinates : "
                        + String.valueOf(event.getX()) + "x"
                        + String.valueOf(event.getY()));
                return true;
            }
        });
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}