Touch screen : Touch « User Event « Android

1. Android
2. User Event
3. Touch

Touch screen

   

package app.test;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.RelativeLayout;

class TrueButton extends BooleanButton {
  protected boolean myValue() {
    return true;
  }

  public TrueButton(Context context, AttributeSet attrs) {
    super(context, attrs);
  }
}

abstract class BooleanButton extends Button {
  protected boolean myValue() {
    return false;
  }

  public BooleanButton(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    String myTag = this.getTag().toString();
    Log.v(myTag, Test.describeEvent(this, event));
    Log.v(myTag, "super onTouchEvent() returns " + super.onTouchEvent(event));
    Log.v(myTag, "and I'm returning " + myValue());
    return (myValue());
  }
}

class FalseButton extends BooleanButton {

  public FalseButton(Context context, AttributeSet attrs) {
    super(context, attrs);
  }
}

public class Test extends Activity implements OnTouchListener {

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

    RelativeLayout layout1 = (RelativeLayout) findViewById(R.id.layout1);
    layout1.setOnTouchListener(this);
    Button trueBtn1 = (Button) findViewById(R.id.trueBtn1);
    trueBtn1.setOnTouchListener(this);
    Button falseBtn1 = (Button) findViewById(R.id.falseBtn1);
    falseBtn1.setOnTouchListener(this);

    RelativeLayout layout2 = (RelativeLayout) findViewById(R.id.layout2);
    layout2.setOnTouchListener(this);
    Button trueBtn2 = (Button) findViewById(R.id.trueBtn2);
    trueBtn2.setOnTouchListener(this);
    Button falseBtn2 = (Button) findViewById(R.id.falseBtn2);
    falseBtn2.setOnTouchListener(this);
  }

  public boolean onTouch(View v, MotionEvent event) {
    String myTag = v.getTag().toString();
    Log.v(myTag, describeEvent(v, event));
    if ("true".equals(myTag.substring(0, 4))) {
      return true;
    } else {
      return false;
    }
  }

  protected static String describeEvent(View view, MotionEvent event) {
    StringBuilder result = new StringBuilder(300);
    result.append("Action: ").append(event.getAction()).append("\n");
    result.append("Location: ").append(event.getX()).append(" x ")
        .append(event.getY()).append("\n");
    if (event.getX() < 0 || event.getX() > view.getWidth()
        || event.getY() < 0 || event.getY() > view.getHeight()) {
      result.append(">>> Touch has left the view <<<\n");
    }
    result.append("Edge flags: ").append(event.getEdgeFlags()).append("\n");
    result.append("Pressure: ").append(event.getPressure()).append("   ");
    result.append("Size: ").append(event.getSize()).append("\n");
    result.append("Down time: ").append(event.getDownTime()).append("ms\n");
    result.append("Event time: ").append(event.getEventTime()).append("ms");
    result.append("  Elapsed: ").append(
        event.getEventTime() - event.getDownTime());
    result.append(" ms\n");
    return result.toString();
  }
}
//main.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- This file is res/layout/main.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"  android:layout_height="fill_parent"
    android:orientation="vertical" >

  <RelativeLayout  android:id="@+id/layout1"
    android:tag="trueLayoutTop"  android:orientation="vertical"
    android:layout_width="fill_parent"  android:layout_height="wrap_content"
    android:layout_weight="1" >

    <com.androidbook.touch.demo1.TrueButton android:text="returns true" 
    android:id="@+id/trueBtn1"  android:tag="trueBtnTop"
    android:layout_width="wrap_content"  android:layout_height="wrap_content" />

    <com.androidbook.touch.demo1.FalseButton android:text="returns false"
    android:id="@+id/falseBtn1"  android:tag="falseBtnTop"
    android:layout_width="wrap_content"  android:layout_height="wrap_content"
    android:layout_below="@id/trueBtn1" />

  </RelativeLayout>
  <RelativeLayout  android:id="@+id/layout2"
    android:tag="falseLayoutBottom"  android:orientation="vertical"
    android:layout_width="fill_parent"  android:layout_height="wrap_content"
    android:layout_weight="1"  android:background="#FF00FF" >

    <com.androidbook.touch.demo1.TrueButton android:text="returns true" 
    android:id="@+id/trueBtn2"  android:tag="trueBtnBottom"
    android:layout_width="wrap_content"  android:layout_height="wrap_content" />

    <com.androidbook.touch.demo1.FalseButton android:text="returns false"
    android:id="@+id/falseBtn2"  android:tag="falseBtnBottom"
    android:layout_width="wrap_content"  android:layout_height="wrap_content"
    android:layout_below="@id/trueBtn2" />

  </RelativeLayout>
</LinearLayout>

   
    
    
  

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