我是 Android 新手，我已经完成了 hello world 教程，并且对正在发生的事情有一个基本的了解。我对我的 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下一个 tocuh 事件的坐标，所以假设用户触摸了坐标 5 ,2 - 屏幕上的文本视图会显示它。
目前我有一个简单的程序，它只加载一个 xml 文件，其中包含我打算在其中写入坐标的文本视图。
提前感谢您，我在 Google 上寻求帮助并搜索了 stackoverflow，但我发现的所有内容要么超出了我的想象，要么不适合这个。干杯。
您可以使用此功能： http: //developer.android.com/reference/android/view/View.html#setOnTouchListener(android.view.View.OnTouchListener)
您可能会大致以这种方式将它放在您的 onCreate 方法中（这次测试过）：
Activity 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;
}
});
}
布局代码
<?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>
编辑：我尝试了我的代码，确实有一些错误。无论如何，我在这里给你的布局可以在我的模拟器上运行。您能否提供更多代码/上下文，以便我了解问题所在？
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.
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.
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:
@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;
}
});
}
以下工作使用 jetboy 示例 android 应用程序上的触摸屏。Joes 代码进行了一项调整，使其在背景中闪耀。我添加的唯一行是
android:background="#0000"
android:layout_height="fill_parent"
android:layout_height="fill_parent"
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;
}
});
}
布局代码
<?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>
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;
}
}