Android复习(三)

Android当中的常见控件

 

Activity03

package org.wp.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.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

/**
 * 1.在Activity03当中,要声明四个控件
 * 2.要为其中的两个控件设置显示的值
 * 3.创建按钮监听事件
 * 
 * @author wp
 * 
 */
public class Activity03 extends Activity {
	private EditText factorOne;
	private EditText factorTwo;
	private TextView symbol;
	private Button calculator;

	@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);
		calculator = (Button) findViewById(R.id.calculator);

		symbol.setText(R.string.symbol);
		calculator.setText(R.string.calculator);

		calculator.setOnClickListener(new View.OnClickListener() {
			public void onClick(View arg0) {
				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);
				startActivity(intent);
			}
		});
	}

	// 当客户点击MENU按钮的时候，调用该方法
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// groupId,itemId,order,title
		menu.add(0, 1, 1, R.string.exit);
		menu.add(0, 2, 2, R.string.about);
		return super.onCreateOptionsMenu(menu);
	}

	// 当客户点击菜单当中的某一个选项时，会调用该方法
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		if (item.getItemId() == 1) {
			finish();
		}
		return super.onOptionsItemSelected(item);
	}
}

 

ResultActivity

package org.wp.activity;

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

/**
 * 1.接收从Activity03当中传递的值 
 * 2.计算两个值的乘积 
 * 3.将计算的结果显示在Activity上
 * 
 * @author wp
 * 
 */
public class ResultActivity extends Activity {
	private TextView resultView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.result);

		resultView = (TextView) findViewById(R.id.result);
		Intent intent = this.getIntent();

		String factorOneStr = intent.getStringExtra("one");
		String factorTwoStr = intent.getStringExtra("two");
		int factorOneInt = Integer.parseInt(factorOneStr);
		int factorTwoInt = Integer.parseInt(factorTwoStr);
		int result = factorOneInt * factorTwoInt;

		resultView.setText(result + "");
	}
}

 

main.xml

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

 

result.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="wrap_content"
  	android:layout_height="wrap_content"
  	>
  	<TextView
  		android:layout_width="fill_parent"
  		android:layout_height="wrap_content"
  		android:id="@+id/result"
	  	/>
</LinearLayout>

 

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
	<string name="hello">Hello World, Activity03!</string>
	<string name="app_name">Activity03</string>
	<string name="resultActivity">resultActivity</string>
	<string name="symbol">乘以</string>
	<string name="calculator">计算</string>
	<string name="exit">退出</string>
	<string name="about">关于</string>
</resources>

 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	package="org.wp.activity" android:versionCode="1" android:versionName="1.0">
	<application android:icon="@drawable/icon" android:label="@string/app_name">
		<activity android:name=".Activity03" android:label="@string/app_name">
			<intent-filter>
				<action android:name="android.intent.action.MAIN" />
				<category android:name="android.intent.category.LAUNCHER" />
			</intent-filter>
		</activity>
		<activity android:name=".ResultActivity" android:label="@string/resultActivity" />
	</application>
	<uses-sdk android:minSdkVersion="4" />
</manifest>