在网上看了android的相关视频，本人也试着写了一些代码。现在我在这里贴出来，用来见证我学习android的历程。
先布局：
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:id="@+id/num1"
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"
android:text="@string/hello"
/>
<EditText
android:id="@+id/num2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/buttonresult"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
result.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">
<TextView
android:id="@+id/result"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</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="symbol">乘以</string>
<string name="buttonresult">计算</string>
<string name="resultLable">result</string>
<string name="exit">退出</string>
<string name="about">关于</string>
<style name="Text">
<item name="android:textSize">18sp</item>
</style>
<style name="SpecialText" parent="@style/Text">
<item name="android:textSize">18sp</item>
<item name="android:textColor">#008</item>
</style>
</resources>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.hs" android:versionCode="1" android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<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/resultLable"></activity>
</application>
</manifest>
Activity03.java
package org.hs;
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 {
/** Called when the activity is first created. */
private EditText num1;
private EditText num2;
private TextView symbol;
private Button buttonresult;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
num1 = (EditText) findViewById(R.id.num1);
num2 = (EditText) findViewById(R.id.num2);
symbol = (TextView) findViewById(R.id.symbol);
buttonresult = (Button) findViewById(R.id.buttonresult);
// symbol.setText("乘以");
// buttonresult.setText("计算");
symbol.setText(R.string.symbol);
buttonresult.setText(R.string.buttonresult);
buttonresult.setOnClickListener(new CalculateListener());
}
@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) {
// 菜单响应
super.onOptionsItemSelected(item);
switch (item.getItemId()) {
case 1:
break;
case 2:
finish();
break;
default:
break;
}
return true;
}
class CalculateListener implements OnClickListener {
public void onClick(View v) {
String num1Str = num1.getText().toString();// 获取值
String num2Str = num2.getText().toString();
// 将两个值存放在Intent对象中
Intent intent = new Intent();
intent.putExtra("one", num1Str);
intent.putExtra("two", num2Str);
intent.setClass(Activity03.this, ResultActivity.class);
// 使用这个Intent对象来启动ResultActivity
Activity03.this.startActivity(intent);
}
}
}
ResultActivity.java
package org.hs;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class ResultActivity extends Activity {
private TextView resultView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
resultView = (TextView) findViewById(R.id.result);
Intent intent = getIntent();
String num1Str = intent.getStringExtra("one");
String num2Str = intent.getStringExtra("two");
int num1 = Integer.parseInt(num1Str);
int num2 = Integer.parseInt(num2Str);
int result = num1 * num2;
resultView.setText(result + "");// setText只接受字符串
}
}
