[android，18]android下常用組件：

一、notification組件的使用:

1、notification 組件就是當來一條短息時，在手機任務欄中顯示出一條短信的提示，點擊時會激活一個activity

 

2、創建和使用：

public void click(Viewview){

//1 Get a reference to the NotificationManager:

// 獲取一個notification的管理者

NotificationManager manager = (NotificationManager)getSystemService(

NOTIFICATION_SERVICE);

 

// 2.初始化 manager要顯示的notification

 

int icon = R.drawable.ic_launcher;

CharSequence tickerText = "Hello 標題";

long when = System.currentTimeMillis();

//構造函數參數:(圖標，標題，notification顯示的時間)

Notificationnotification = new Notification(icon, tickerText, when);

 

//3. notification的具體事件

// 指定聲音

notification.sound = Uri.fromFile(newFile("/sdcard/ha.mp3"));

notification.ledARGB // 顯示什麼樣子的led燈

//震動 指定定震動時間 單位毫秒

Notification.vibrate() ; //參數long[] 數組 20 50 80

//指定notification的顯示狀態。(FLAG_NO_CLEAR:不顯示,FLAG_INSISTENT:一直顯示)

notification.flags = Notification.FLAG_NO_CLEAR;

 

// 延期的意圖

Intent intent = new Intent();

intent.setAction(Intent.ACTION_CALL);

intent.setData(Uri.parse("tel:123456"));

 

//創建延期意圖getActivity方法參數（上下文， 0，意圖對象，0）

PendingIntent contentIntent = PendingIntent.getActivity(this, 0,intent, 0);

為notification 設置延期意圖:

notification.contentIntent = contentIntent;

 

//setLatestEventInfo()方法是設置點擊notification打開的內容，和執行延期意圖。

notification.setLatestEventInfo(this, "標題", "正文", contentIntent);

//4.利用notification管理者把notification顯示出來

manager.notify(0, notification);

 

}

}

二、dialog對話框的使用:

 

1、確定取消對話框:

public void click1(View view) {

// 1.創建一個對話框的構建器

AlertDialog.Builderbuilder = new Builder(this);

builder.setIcon(R.drawable.ic_launcher);

builder.setTitle("我是標題");

builder.setMessage("我是正文");

//對話框的確定按鈕

builder.setPositiveButton("確定", newOnClickListener() {

 

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generatedmethod stub

System.out.println("確定被點擊了");

}

});

//設置取消按鈕和點擊事件

builder.setNegativeButton("取消", newOnClickListener() {

 

@Override

public void onClick(DialogInterface dialog, int which) {

// TODO Auto-generatedmethod stub

System.out.println("取消被點擊了");

}

});

//創建對話框，再顯示出來

builder.create().show();

}

2、選擇對話框

public void click2(View view) {

AlertDialog.Builder builder = new Builder(this);

final String[] items = { "紅", "藍", "綠" };

//設置選擇對話框的數據和 點擊事件

builder.setItems(items, new OnClickListener() {

 

方法參數(當前dialog , 被點擊的條目在items數組下標)

public voidonClick(DialogInterface dialog, int which) {

Toast.makeText(getApplicationContext(),

items[which] + "被點擊了",

0).show();

 

}

});

//顯示對話框

builder.create().show();

}

3、單選對話框:

public void click3(View view) {

final CharSequence[] items = { "Red","Green", "Blue" };

 

AlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setTitle("Pick a color");

//方法參數（數組，默認選擇的條目小標-1沒有默認選擇，點擊事件）

builder.setSingleChoiceItems(items, -1,

new DialogInterface.OnClickListener() {

public voidonClick(DialogInterface dialog, int item) {

Toast.makeText(getApplicationContext(), items[item],

Toast.LENGTH_SHORT).show();

// 關閉對話框

dialog.dismiss();

}

});

AlertDialog alert = builder.create();

alert.show();

}

4、多選對話框:

public void click4(View view) {

final CharSequence[] items = { "Red","Green", "Blue" };

 

AlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setTitle("Pick a color");

//方法參數：(數組，默認選擇的數組，true表示對應的條目選中，點擊事件)

builder.setMultiChoiceItems(items,

new boolean[] { false, true, false },

new OnMultiChoiceClickListener() {

 

@Override

public voidonClick(DialogInterface dialog, int which,

boolean isChecked) {

 

Toast.makeText(getApplicationContext(),

items[which] + "" + isChecked,

Toast.LENGTH_SHORT).show();

}

});

//設置確認按鈕

builder.setPositiveButton("確定", newOnClickListener() {

 

@Override

public voidonClick(DialogInterface dialog, int which) {

// TODO Auto-generated method stub

 

}

});

 

AlertDialog alert = builder.create();

alert.show();

}

 

5、進度條對話框:ProgressDialog 類

public void click5(Viewview) {

ProgressDialog pd = new ProgressDialog(this);

pd.setTitle("提示標題");

pd.setMessage("處理中...");

pd.show();

}

 

三、下拉列表組件

1、下拉列表的組件:

android:id="@+id/spinner"

android:layout_width="fill_parent"

android:layout_height="wrap_content" />

 

2、下拉列表的操作:

//獲取下拉列表組件

Spinner spinner = (Spinner) this.findViewById(R.id.spinner);

//創建適配器

ArrayAdapter adapter = newArrayAdapter(this,

android.R.layout.simple_spinner_item);

//為適配設置布局

//android.R.layout.simple_spinner_dropdown_item

adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

adapter.add("java");

adapter.add("dotNet");

adapter.add("php");

 

spinner.setAdapter(adapter);

//點擊事件

spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

 

@Override

public voidonItemSelected(AdapterViewparent, View view,

int position, long id) {

// TODO Auto-generated method stub

 

}

 

@Override

public voidonNothingSelected(AdapterViewparent) {

// TODO Auto-generated method stub

 

}

});

 

四、拖動條:

1、拖動條組件：

android:id="@+id/seekBar1"

android:layout_width="match_parent"

android:layout_height="wrap_content" />

2、組件的使用:

//拖動條組件對象

seekBar1 = (SeekBar) this.findViewById(R.id.seekBar1);

 

seekBar1.setMax(100);//設置拖動條最大

seekBar1.setProgress(50);//拖動條當前的值

//拖動時的事件

seekBar1.setOnSeekBarChangeListener(new OnSeekBarChangeListener(){

 

//停止拖動時的方法

public voidonStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

System.out.println("停止拖動了");

//獲取當前的位置

int position = seekBar.getProgress();

 

}

 

@Override

//開始拖動時的方法:

public voidonStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

System.out.println("開始拖動了");

 

}

 

@Override

public voidonProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

// TODO Auto-generated method stub

 

}

});

 

五、菜單：

在activity類中覆寫兩個方法:

 

@Override//設置菜單項

public boolean onCreateOptionsMenu(Menu menu) {

menu.add(Menu.NONE, 1, Menu.NONE, "添加");

menu.add(Menu.NONE, 2, Menu.NONE, "更新");

return super.onCreateOptionsMenu(menu);

}

 

@Override//點擊菜單項的事件

public boolean onMenuItemSelected(int featureId, MenuItem item) {

switch (item.getItemId()) {

case 1://添加

Log.i("tag","add was selected");

return true;

case 2://更新

Log.i("tag","update was selected");

return true;

default:

returnsuper.onMenuItemSelected(featureId, item);

}

}

六、輸入內容自動完成文本框（AutoCompleteTextView）

1、組件

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:completionThreshold="1"

android:id="@+id/name" />



2、操作:

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

String[] names = {"老張", "老方", "老畢", "李明" , "李麗", "陳江", "abc","acc"};

AutoCompleteTextViewnameText = (AutoCompleteTextView)

this.findViewById(R.id.name);

ArrayAdapteradapter = new ArrayAdapter(

this,android.R.layout.simple_dropdown_item_1line, names);

nameText.setAdapter(adapter);

}

 

七．ScrollView ：滾動顯示內容

 

 

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

 

android:layout_width="match_parent"

android:layout_height="match_parent"

android:id="@+id/tv"

/>