Android学习07-----事件处理(4)键盘事件和触摸事件

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七、键盘事件

Main.xml

 

Activity：

package com.iflytek.activity;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.EditText;
import android.widget.ImageView;

public class EventActivity extends Activity {

	private EditText input = null;
	private ImageView img = null;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		super.setContentView(R.layout.main);
		this.input = (EditText) super.findViewById(R.id.input); // 取得组件
		this.img = (ImageView) super.findViewById(R.id.img); // 取得组件
		this.input.setOnKeyListener(new OnKeyListenerImpl());
	}

	private class OnKeyListenerImpl implements OnKeyListener {

		public boolean onKey(View v, int keyCode, KeyEvent event) {
			switch (event.getAction()) {
			case KeyEvent.ACTION_UP:
				String msg = EventActivity.this.input.getText().toString(); // 取得输入的文字信息
				if (msg.matches("\\w+@\\w+\\.\\w+")) { // 验证通过
					EventActivity.this.img.setImageResource(R.drawable.right); // 设置正确图片
				} else {
					EventActivity.this.img.setImageResource(R.drawable.wrong); // 设置错误图片
				}
			case KeyEvent.ACTION_DOWN: // 键盘按下
				break;
			}
			return false;
		}
	}
}

 

 

八、触摸事件

Demo01_ 获取坐标 :

Main.xml

Activity：

package com.iflytek.activity;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.TextView;

public class EventActivity extends Activity {
	
	private TextView info = null;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
    	this.info = (TextView) super.findViewById(R.id.info);
		this.info.setOnTouchListener(new OnTouchListenerImpl());
    }
    
	private class OnTouchListenerImpl implements OnTouchListener {

		public boolean onTouch(View v, MotionEvent event) {
			EventActivity.this.info.setText("X = " + event.getX() + "，Y = "
					+ event.getY()); // 设置文本
			return false;
		}
	}
}

 

Demo02_ 绘图：

Main.xml

Activity：

package com.iflytek.activity;

import android.app.Activity;
import android.os.Bundle;

public class EventActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

 

MyPaintView.java:

package com.iflytek.activity;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

/**
 * @author xdwang
 * 
 * @create 2012-9-3 下午9:46:43
 * 
 * @email:[email protected]
 * 
 * @description
 * 
 */
public class MyPaintView extends View {
	private List allPoint = new ArrayList(); // 保存所有的操作坐标

	public MyPaintView(Context context, AttributeSet attrs) { // 接收Context，同时接收属性集合
		super(context, attrs); // 调用父类的构造
		super.setOnTouchListener(new OnTouchListenerImpl());
	}

	private class OnTouchListenerImpl implements OnTouchListener {
		public boolean onTouch(View v, MotionEvent event) {
			Point p = new Point((int) event.getX(), (int) event.getY()); // 将坐标保存在Point类
			if (event.getAction() == MotionEvent.ACTION_DOWN) { // 按下，表示重新开始保存点
				MyPaintView.this.allPoint = new ArrayList(); // 重绘
				MyPaintView.this.allPoint.add(p); // 保存点
			} else if (event.getAction() == MotionEvent.ACTION_UP) { // 用户松开
				MyPaintView.this.allPoint.add(p); // 记录坐标点
				MyPaintView.this.postInvalidate(); // 重绘图形
			} else if (event.getAction() == MotionEvent.ACTION_MOVE) { // 用户移动
				MyPaintView.this.allPoint.add(p); // 记录坐标点
				MyPaintView.this.postInvalidate(); // 重绘图形
			}
			return true; // 表示下面的操作不再执行了。
		}
	}

	@Override
	protected void onDraw(Canvas canvas) { // 进行绘图
		Paint p = new Paint(); // 依靠此类开始画线
		p.setColor(Color.RED);// 定义图的颜色
		if (MyPaintView.this.allPoint.size() > 1) { // 现在有坐标点保存的时候可以开始进行绘图
			Iterator iter = MyPaintView.this.allPoint.iterator();
			Point first = null;
			Point last = null;
			while (iter.hasNext()) {
				if (first == null) {
					first = (Point) iter.next(); // 取出坐标
				} else {
					if (last != null) { // 前一阶段已经完成了
						first = last; // 重新开始下一阶段
					}
					last = (Point) iter.next(); // 结束点坐标
					canvas.drawLine(first.x, first.y, last.x, last.y, p);
				}
			}
		}
	}

}