從Android Training開始學起
參考網址: http://developer.android.com/training/basics/firstapp/starting-activity.html第一個範例
功能:
建立一個應用程式，在該程式中的訊息框輸入訊息A後，按下Send 按鈕則可切換至另一畫面，此畫面將訊息A重新顯示出來。應用:
1. 練習UI元件配置，EditText, Button元件的應用以及Layout的基礎。2. 運用Intent來做兩個Activity之間切換，並且傳遞訊息。
程式碼:
1. activity_input_box.xml:<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/TableLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".InputBoxActivity" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/ID" />
<EditText
android:id="@+id/EditTMessage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text" >
<requestFocus />
</EditText>
<Button
android:id="@+id/BtnSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="SendBtn1_OnClick"
android:text="@string/SendBtn1" />
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/Number" />
<EditText
android:id="@+id/EditTNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="number" />
</TableRow>
</TableLayout>
2. activity_send_result.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SendResult" >
<TextView
android:id="@+id/Label1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="15dp"
android:layout_marginTop="22dp"
android:text="@string/ID" />
<TextView
android:id="@+id/ShowM1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/Label1"
android:layout_alignBottom="@+id/Label1"
android:layout_marginLeft="16dp"
android:layout_toRightOf="@+id/Label1"
android:text="""" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/Label1"
android:layout_marginTop="15dp"
android:text="@string/Number" />
<TextView
android:id="@+id/textShowNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textView1"
android:layout_alignBottom="@+id/textView1"
android:layout_toRightOf="@+id/ShowM1"
android:text="" "" />
</RelativeLayout>
3. InputBoxActivity.java
package com.example.inputbox;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
public class InputBoxActivity extends Activity {
public final static String EM1 = "ID";
public final static String EM2 = "NUMBER";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_input_box);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_input_box, menu);
return true;
}
public void SendBtn1_OnClick(View v1){
Intent i1 = new Intent(this, SendResult.class);
EditText idinput = (EditText) findViewById(R.id.EditTMessage);
EditText number = (EditText) findViewById(R.id.EditTNumber);
String s1 = idinput.getText().toString();
String s2 = number.getText().toString();
Log.d("Test", "prepare to put s1");
i1.putExtra(EM1, s1);
Log.d("Test", "prepare to put s2");
i1.putExtra(EM2, s2);
Log.d("Test", "Put Ok");
startActivity(i1);
}
}
4. SendResult.java
package com.example.inputbox;
import android.os.Bundle;
import android.app.Activity;
import android.widget.TextView;
public class SendResult extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_send_result);
TextView M1 = (TextView) findViewById(R.id.ShowM1);
TextView M2 = (TextView) findViewById(R.id.textShowNumber);
String g1 = getIntent().getStringExtra(InputBoxActivity.EM1);
String g2 = getIntent().getStringExtra(InputBoxActivity.EM2);
M1.setText(g1);
M2.setText(g2);
}
}
5. InputBoxManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.inputbox"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.inputbox.InputBoxActivity"
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="com.example.inputbox.SendResult"
android:label="@string/title_activity_send_result" >
</activity>
</application>
</manifest>
圖示:
 |
| 起始畫面 |
 |
| 按下按鈕後的新顯示畫面 |
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