Android學習筆記——menu

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該工程的功能是實現兩個數相乘，並在另外一個Activity中顯示計算的結果

 

以下的代碼是MainActivity.java中的代碼

package com.example.menu;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 MainActivity extends Activity {        private EditText factorOne;    private EditText factorTwo;    private TextView symbol;    private Button calculate;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_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("乘以");        //calculate.setText("計算");                //為symbol和calculate設定顯示的值        symbol.setText(R.string.symbol);        calculate.setText(R.string.calculate);        //將監聽器的對象綁定到按鈕對象上面        calculate.setOnClickListener(new CalculateListener());    }            @Override    public boolean onCreateOptionsMenu(Menu menu) {        // TODO Auto-generated method stub        menu.add(0,1,1,R.string.exit);        menu.add(0,2,2,R.string.about);        return super.onCreateOptionsMenu(menu);    }    //當客戶點擊MENU按鈕的時候，調用該方法    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // TODO Auto-generated method stub        if(item.getItemId() == 1){            finish();        }        return super.onOptionsItemSelected(item);    }    class CalculateListener implements OnClickListener{        @Override        public void onClick(View v) {            // TODO Auto-generated method stub            //取得兩個EditText控制項的值            String factorOneStr = factorOne.getText().toString();            String factorTwoStr = factorTwo.getText().toString();            //將這兩個值存放到Intent對象當中            Intent intent = new Intent();            intent.putExtra("one",factorOneStr);            intent.putExtra("two",factorTwoStr);            intent.setClass(MainActivity.this,ResultActivity.class );            //使用這個Intent對象來啟動ResultActivity            MainActivity.this.startActivity(intent);        }                    }}

 

以下的代碼是ResultActivity.java中的代碼

package com.example.menu;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) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_result);        resultView = (TextView)findViewById(R.id.result);        //得到Intent對象當中的值        Intent intent = getIntent();        String factorOneStr = intent.getStringExtra("one");        String factorTwoStr = intent.getStringExtra("two");        int factorOneInt = Integer.parseInt(factorOneStr);        int factorTwoInt = Integer.parseInt(factorTwoStr);        //計算兩個值的積        int result = factorOneInt * factorTwoInt;        resultView.setText(result + "");    }}

 

以下的代碼是activity_main.xml中的代碼

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <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>

 

以下的代碼是activity_result.xml中的代碼

<?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>

 

以下的代碼是string.xml中的代碼

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">menu</string>    <string name="hello_world">Hello world!</string>    <string name="resultLabel">result</string>    <string name="symbol">乘法</string>    <string name="calculate">計算</string>    <string name="exit">退出</string>    <string name="about">關於</string></resources>

 

以下的代碼是AndroidManifest.xml中的代碼

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.menu"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="21" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            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">        </activity>    </application></manifest>

 

Android學習筆記——menu