Android學習筆記 - 長按選單(ContextMenu)

1. 在螢幕按下2至3秒之後出現選單，這是使用ContextMenu物件來達到此效果

2. 需覆寫onCreateContextMenu及onContextItemSelected這二個方法

3. MainActivity.java

import android.app.Activity;
import android.app.Activity;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuItem;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        LinearLayout windowLayout = (LinearLayout) findViewById(R.id.windowLayout);
        //註冊長按選單
        this.registerForContextMenu(windowLayout);
    }


    @Override
    public boolean onContextItemSelected(MenuItem item) {
        //當使用者點選項目時，所需的動作
        Toast.makeText(this, "您選擇的是"+item.getTitle(), Toast.LENGTH_SHORT).show();
        return super.onContextItemSelected(item);
    }


    @Override
    public void onCreateContextMenu(ContextMenu contextMenu, View view, ContextMenuInfo menuInfo) {
        //設定選單內容
        super.onCreateContextMenu(contextMenu, view, menuInfo);
        contextMenu.add(0, 0, 0, "紅茶");
        contextMenu.add(0, 1, 0, "奶茶");
        contextMenu.add(0, 2, 0, "綠茶");
        contextMenu.add(0, 3, 0, "青茶");
    }
}

3. main.xml(Layout)

<?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"
    android:id="@+id/windowLayout">
</LinearLayout>

4. 執行之後的畫面。

Android學習筆記 - 網格視圖(GridView)

1. 利用網格視圖(GridView)物件來呈現項目列表

2. MainActivity.java

package org.me.android_gridview;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.Toast;

public class MainActivity extends Activity {
    private GridView gridView;
    
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        gridView = (GridView) findViewById(R.id.gridView);
        final String[] list = new String[]{"王建民","郭泓志","倪福德","胡金龍"};
        //設定列表內容
        ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,list);
        //設定列數
        gridView.setNumColumns(2);
        gridView.setAdapter(adapter);
        //項目被點選時，回應的動作
        gridView.setOnItemClickListener(new GridView.OnItemClickListener(){
           @Override
           public void onItemClick(AdapterView adapterView,View view,int position,long id) {
               Toast.makeText(MainActivity.this, "您選擇的是"+list[position], Toast.LENGTH_SHORT).show();
           }
        });
    }
}

3. main.xml(Layout)

<?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">" 
    <GridView
        android:id="@+id/gridView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
    </GridView>
</LinearLayout>

4. 執行之後的畫面。

Android學習筆記 - 自動填入文字(AutoCompleteTextView)

1. 利用(AutoCompleteTextView)物件來達到自動填入文字

2. MainActivity.java

package org.me.android_autocompletetextview;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class MainActivity extends Activity {
    private AutoCompleteTextView autoComplete;
    
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        autoComplete = (AutoCompleteTextView) findViewById(R.id.autoComplete);
        String[] phone = new String[]{"0986254878","0985225787","098525879","0985012486","0985658745"};
        //設定自動填入的文字內容
        ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item,phone);
        autoComplete.setAdapter(adapter);
    }
}

3. main.xml(Layout)

<?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">" 
    <AutoCompleteTextView
        android:id="@+id/autoComplete"
        android:layout_width="fill_parent"
        android:layout_height="50px">
    </AutoCompleteTextView>
</LinearLayout>

4. 在「自動填入文字框」輸入文字之後出現的畫面。

Android學習筆記 - 下拉式選單(Spinner)

1. 透過Spinner物件建立下拉式選單

2. MainActivity.java

package org.me.android_spinner;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        Spinner spinner = (Spinner) findViewById(R.id.spinnner);
        //建立一個ArrayAdapter物件，並放置下拉選單的內容
        ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item,new String[]{"紅茶","奶茶","綠茶"});
        //設定下拉選單的樣式
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);
        //設定項目被選取之後的動作
        spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
            public void onItemSelected(AdapterView adapterView, View view, int position, long id){
                Toast.makeText(MainActivity.this, "您選擇"+adapterView.getSelectedItem().toString(), Toast.LENGTH_LONG).show();
            }
            public void onNothingSelected(AdapterView arg0) {
                Toast.makeText(MainActivity.this, "您沒有選擇任何項目", Toast.LENGTH_LONG).show();
            }
        });
    }
}

3. main.xml(Layout)

<?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/textView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
    </TextView>
    <Spinner
        android:id="@+id/spinnner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">
    </Spinner>
</LinearLayout>

4. 下拉式選單畫面

HTC Hero 將升級為Android 2.1版

HTC於Plurk公告將於2010年4月底前透過無線更新的方式,

將HTC Hero 升級為Android 2.1版本,並同時升級

新版HTC SENSE Experience之支援服務。

有使用的人可以先備份手機準備更新囉… 

From HTC Hero Plurk

Present Perfect Continuous(現在完成進行式)

Present Perfect Continuous簡單來說就是發生在過去到現在持續的事件

以下是Present Perfect Continuous發生的時機
1. 從過去開始並持續到現在
   e.g. I have been watching TV for two hours.

2. 最近
   e.g. I have been watching TV lately.

Past Continuous(過去進行式)

Past Continuous簡單來說就是發生在過去的Long Action，而Simple Past就是發生在過去的Short Action

以下是Past Continuous發生的時機：
1. 在過去被中斷的動作
   e.g. While I was reading , he called.
        I was reading when he called.

2. 特定一個時間點發生
   e.g. I was reading last night at 7.
        At midnight, I was reading.

3. 過去並行的動作
   e.g. I was reading while he was watching TV.

4. 過去常常重覆的動作
   e.g. I was always working late.