安卓点击事件、触摸事件

1.创建安卓的项目

2.连接好自己的模拟器

3.使用直接拖动的方式实现布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <EditText
            android:id="@+id/editText1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textPersonName"
            android:text="请输入用户名" >

            <requestFocus />
        </EditText>

        <EditText
            android:id="@+id/editText3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:inputType="textPersonName"
            android:text="请输入密码" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="right" >

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="登录" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="注册" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="208dp"
            android:layout_height="208dp"
            android:layout_weight="0.52"
            android:src="@drawable/ic_launcher" />

    </LinearLayout>

</LinearLayout>

　

4.编写MainActivity.java文件

package com.example.xzt;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
/**
 * 该类实现的点击事件的接口 要重写点击的方法
 * @author xingge
 *
 */

public class MainActivity extends Activity implements OnClickListener {
    /**
     * 设置为全局变量后自动赋值为空
     */
    ImageView image1;
    int toumingdu=100;
    private Button button1;
    private Button button2;
    TextView text1;
    TextView text2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        /**
         * 继承了Activity后 获取控件只要this点即可
         */
        button1 = (Button) this.findViewById(R.id.button1);
        button2 = (Button) this.findViewById(R.id.button2);
         text1 =(TextView) this.findViewById(R.id.editText1);
         text2 =(TextView) this.findViewById(R.id.editText3);
        image1 = (ImageView) this.findViewById(R.id.imageView1);
        
        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
    }

    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onClick(View arg0) {
        /**
         * argo 表示获取点击事件是空间的id
         */
        switch (arg0.getId()) {
        case R.id.button1:
            text1.setText("login");
            break;
        case R.id.button2:
            text2.setText("logout");
            break;

        
        }
        
    

    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        switch (keyCode) {
        case KeyEvent.KEYCODE_DPAD_UP:
            toumingdu +=10;
            image1.setAlpha(toumingdu);//设置透明度的方法
            break;
        case KeyEvent.KEYCODE_DPAD_DOWN:
            toumingdu -=10;
            image1.setAlpha(toumingdu);//设置透明度的方法
            break;

        
        }

        return super.onKeyDown(keyCode, event);
    }
    
    /**
     * 显示触摸的位置
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // TODO Auto-generated method stub
        float x = event.getX();//获得x坐标
        float y = event.getY();
        text1.setText("位置x："+x);//设置文本
        text2.setText("位置y："+y);
        
        return super.onTouchEvent(event);
    }
    
    
}

5.运行结果