Android06_Android中惯用控件

Android06_Android中常用控件

一、Android的常用控件

Android常用的控件有TextView、EditText、Button、Menu，下面将使用一个乘法计算器的例子来说明这几种常用控件的使用。

二、计算器功能界面

1.计算界面

          
  2.输入界面

          
  3.结果界面

         

三、代码

1.目录结构： 

         
  2.代码

Activity03.java

 

package com.android.activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Activity03 extends Activity {

	private EditText factorOne = null;  //被乘数
	private TextView symbol = null;     //符号
	private EditText factorTwo = null;  //乘数
	private Button calculate = null;      //计算按钮
	
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        factorOne = (EditText)findViewById(R.id.factorOne);
        factorTwo = (EditText)findViewById(R.id.factorTwo);
        symbol = (TextView)findViewById(R.id.symbol);
        calculate = (Button)findViewById(R.id.calculate);
        
        symbol.setText(R.string.symbol);
        calculate.setText(R.string.calculate);
        
        calculate.setOnClickListener(new MyButtonListener());
    }
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		menu.add(0,1,1,R.string.exit);
		menu.add(0,2,2,R.string.about);
		
		return super.onCreateOptionsMenu(menu);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		if(item.getItemId() == 1){
			finish();
		}
		
		return super.onOptionsItemSelected(item);
	}

	class MyButtonListener implements OnClickListener{

		public void onClick(View v) {
			String factorOneStr = factorOne.getText().toString();
			String factorTwoStr = factorTwo.getText().toString();
			
			Intent intent = new Intent();
			intent.putExtra("one", factorOneStr);
			intent.putExtra("two", factorTwoStr);
			intent.setClass(Activity03.this, ResultActivity.class);
			Activity03.this.startActivity(intent);
			
		}
	}
}

  main.xml——Activity03布局文件

 

<?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"
    >
<EditText 
	android:id="@+id/factorOne"
	android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
/>
<TextView  
	android:id="@+id/symbol"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<EditText 
	android:id="@+id/factorTwo"
	android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
/>
<Button 
	android:id="@+id/calculate"
	android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
/>
</LinearLayout>

  string.xml

 

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, Activity03!</string>
    <string name="app_name">Activity测试03</string>
    <string name="symbol">乘以</string>
    <string name="calculate">计算</string>
    <string name="result">结果</string>
    <string name="exit">退出</string>
    <string name="about">关于</string>
</resources>

ResultActivity.java——结果显示

 

package com.android.activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class ResultActivity extends Activity{

	private TextView resultText = null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.result);
		
		Intent intent = getIntent();
		String factorOne = intent.getStringExtra("one");
		String factorTwo = intent.getStringExtra("two");
		
		int resultTemp = Integer.parseInt(factorOne)*Integer.parseInt(factorTwo);
		System.out.println("-----dfss--------"+resultTemp);
		String result = resultTemp+"";
		
		resultText = (TextView)findViewById(R.id.result);
		resultText.setText(result);
	}

	
}

  result.xml——ResultActivity布局文件

 

<?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/result"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>

 完成！