Android 按键式事件

时间：2021-02-24 18:53:44

1、

package com.fish.helloworld;

import android.app.Activity;

import android.graphics.Color;

import android.os.Bundle;

import android.util.Log;

import android.view.KeyEvent;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;

public class MainActivity extends Activity {

    private ImageView m_ImageView;

    private TextView m_TextView;

    private float m_AlphaValue;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_test_key);

        m_ImageView = (ImageView)findViewById(R.id.imageView1);

        m_TextView = (TextView)findViewById(R.id.textView1);

        m_AlphaValue = 0xFF;

        m_ImageView.setAlpha(m_AlphaValue);

        m_TextView.setText("Alpha = " + m_AlphaValue * 100 / 0xff + "%");

    }

    @Override

    public boolean onKeyDown(int keyCode, KeyEvent msg){

        Log.v("KeyCode","KeyCode = " + keyCode);

        Log.v("msg","msg = " + msg);

        switch(keyCode){

        case KeyEvent.KEYCODE_VOLUME_UP:

            m_AlphaValue += 20;

            break;

        case KeyEvent.KEYCODE_VOLUME_DOWN:

            m_AlphaValue -= 20;

            break;

            default:

                break;

        }

        if(m_AlphaValue >= 0xFF) m_AlphaValue = 0xFF;

        if(m_AlphaValue <= 0x00) m_AlphaValue = 0x0;

        m_ImageView.setAlpha(m_AlphaValue);

        m_TextView.setText("Alpha = " + m_AlphaValue * 100 / 0xff + "%");

        return super.onKeyDown(keyCode, msg);

    }

}

2、

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="110dp"

        android:layout_height="wrap_content"

        android:layout_weight="0.03"

        android:text="TextView" />

    <ImageView

        android:id="@+id/imageView1"

        android:layout_width="241dp"

        android:layout_height="195dp"

        android:layout_marginRight="37dp"

        android:layout_marginTop="176dp"

        android:layout_weight="0.06"

        android:src="@drawable/ic_launcher" />

</LinearLayout>

3、触摸屏

package com.fish.helloworld;

import android.app.Activity;

import android.graphics.Color;

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;

public class MainActivity extends Activity {

    private TextView m_TextView;

    private TextView m_TextView2;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.skeleton_activity);

        m_TextView = (TextView)findViewById(R.id.textView1);

        m_TextView2 = (TextView)findViewById(R.id.textView2);

    }

    @Override

    public boolean onTouchEvent(MotionEvent event){

        int action = event.getAction();

        float x = event.getX();

        float y = event.getY();

        m_TextView.setText("Action = " + action);

        m_TextView2.setText(x + " + " + y);

        return true;

    }

}

4、

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