android 開發-Toast控制項的實現

標籤：

• Toast多士：

　　Toast內容簡單，不做過多介紹，Toast支援內建簡單多士，自訂多士。內容簡單可見代碼，詳見API。A toast provides simple feedback about an operation in a small popup. It only fills the amount of space required for the message and the current activity remains visible and interactive. For example, navigating away from an email before you send it triggers a "Draft saved" toast to let you know that you can continue editing later. Toasts automatically disappear after a timeout.

• 　　程式碼範例

　　activity_main.xml

　　　　

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2     xmlns:tools="http://schemas.android.com/tools" 3     android:layout_width="match_parent" 4     android:layout_height="match_parent" 5     android:paddingBottom="@dimen/activity_vertical_margin" 6     android:paddingLeft="@dimen/activity_horizontal_margin" 7     android:paddingRight="@dimen/activity_horizontal_margin" 8     android:paddingTop="@dimen/activity_vertical_margin" 9     tools:context=".MainActivity" >10 11     <Button12         android:id="@+id/button1"13         android:layout_width="wrap_content"14         android:layout_height="wrap_content"15         android:layout_alignParentTop="true"16         android:layout_centerHorizontal="true"17         android:layout_marginTop="190dp"18         android:text="多士按鈕" />19 20     <Button21         android:id="@+id/button2"22         android:layout_width="wrap_content"23         android:layout_height="wrap_content"24         android:layout_alignLeft="@+id/button1"25         android:layout_below="@+id/button1"26         android:layout_marginTop="20dp"27         android:text="自訂多士" />28 29 </RelativeLayout>

 

　　toast_layout.xml

　　　　

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:id="@+id/toast_layout_root"              android:orientation="horizontal"              android:layout_width="fill_parent"              android:layout_height="fill_parent"              android:padding="8dp"              android:background="#DAAA">                  <ImageView android:src="@drawable/droid"               android:layout_width="wrap_content"               android:layout_height="wrap_content"               android:layout_marginRight="8dp"               />    <TextView android:id="@+id/text"              android:layout_width="wrap_content"              android:layout_height="wrap_content"              android:textColor="#FFF"              /></LinearLayout>

　　Activity

 1 package com.example.android_toast; 2  3 import android.app.Activity; 4 import android.os.Bundle; 5 import android.view.Gravity; 6 import android.view.Menu; 7 import android.view.View; 8 import android.view.View.OnClickListener; 9 import android.view.ViewGroup;10 import android.widget.Button;11 import android.widget.TextView;12 import android.widget.Toast;13 /**14  * @author xiaowu15  * NOTE:Toast多士，支援內建簡單多士，自訂多士。內容簡單可見代碼，詳見API16  */17 public class MainActivity extends Activity {18     private Button button ;19     private Button button2 ;20     @Override21     protected void onCreate(Bundle savedInstanceState) {22         super.onCreate(savedInstanceState);23         setContentView(R.layout.activity_main);24         button = (Button) this.findViewById(R.id.button1);25         button2 = (Button)this.findViewById(R.id.button2);26         27         //為按鈕添加點擊監聽事件28         button.setOnClickListener(new View.OnClickListener() {29             @Override30             public void onClick(View v) {31                 // TODO Auto-generated method stub32                 //Toast.makeText(MainActivity.this, "多士內容", 1).show();                33                 //建立多士對象34                 Toast toast =Toast.makeText(MainActivity.this, "多士內容", 0);35                 //設定多士在視圖中顯示的位置36                 toast.setGravity(Gravity.BOTTOM|Gravity.CENTER, 0, 0);37                 toast.show();38             }39         });40         41         //為按鈕添加點擊監聽事件42         button2.setOnClickListener(new OnClickListener() {43             @Override44             public void onClick(View v) {45                 // TODO Auto-generated method stub46                 //通過xml設定檔，載入自訂多士視圖47                 View view = getLayoutInflater().inflate(R.layout.toast_layout, (ViewGroup) findViewById(R.id.toast_layout_root));48                 //通過該視圖查詢檢視表中的對象textView49                 TextView textView = (TextView) view.findViewById(R.id.text);50                 textView.setText("多士內容");51 //                Toast toast = new Toast(MainActivity.this);52                 Toast toast = new Toast(getApplicationContext());53                 //設定多士在視圖中顯示的位置54                 toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);55                 //設定多士限時時間長度56                 toast.setDuration(Toast.LENGTH_LONG);57                 toast.setView(view);58                 toast.show();59             }60         });61         62     }63 64     @Override65     public boolean onCreateOptionsMenu(Menu menu) {66         // Inflate the menu; this adds items to the action bar if it is present.67         getMenuInflater().inflate(R.menu.main, menu);68         return true;69     }70 71 }

 

android 開發-Toast控制項的實現