Android 的一些提示框

1.在測試時,如何實現一個提示

可以使用

1. Toast.makeText(this, "這是一個提示", Toast.LENGTH_SHORT).show();
2. //從資源文件string.xml 里面取提示信息
3. Toast.makeText(this, getString(R.string.welcome), Toast.LENGTH_SHORT).show();

這個提示會幾秒鍾后消失

 

2.可以使用AlertDialog.Builder 才產生一個提示框.

   例如像messagebox那樣的

1.    new AlertDialog.Builder(this)
2.      .setTitle("Android 提示")
3.      .setMessage("這是一個提示,請確定")
4.      .show();

帶一個確定的對話框

1. new AlertDialog.Builder(this)
2.           .setMessage("這是第二個提示")
3.           .setPositiveButton("確定",
4.                          new DialogInterface.OnClickListener(){
5.                                  public void onClick(DialogInterface dialoginterface, int i){
6.                                      //按鈕事件
7.                                   }
8.                           })
9.           .show();

 

AlertDialog.Builder 還有很多復雜的用法,有確定和取消的對話框

1. new AlertDialog.Builder(this)
2.          .setTitle("提示")
3.          .setMessage("確定退出?")
4.          .setIcon(R.drawable.quit)
5.          .setPositiveButton("確定", new DialogInterface.OnClickListener() {
6.         public void onClick(DialogInterface dialog, int whichButton) {
7.          setResult(RESULT_OK);//確定按鈕事件
8.          finish();
9.          }
10.          })
11.          .setNegativeButton("取消", new DialogInterface.OnClickListener() {
12.         public void onClick(DialogInterface dialog, int whichButton) {
13.          //取消按鈕事件
14.          }
15.          })
16.          .show();

3.menu 的用法.

1. public static final int ITEM_1_ID = Menu.FIRST;
2. public static final int ITEM_2_ID = Menu.FIRST + 1;
3. public static final int ITEM_3_ID = Menu.FIRST + 2;
4.     
5. public boolean onCreateOptionsMenu(Menu menu) {
6.          super.onCreateOptionsMenu(menu);
7. //不帶圖標的menu
8.          menu.add(0, ITEM_1_ID, 0, "item-1");       
9. //帶圖標的menu
10.          menu.add(0, ITEM_2_ID, 1, "item-2").setIcon(R.drawable.editbills2);
11.          menu.add(0, ITEM_3_ID, 2, "item-3").setIcon(R.drawable.billsum1);
12.         return true;
13. }
14. public boolean onOptionsItemSelected(MenuItem item){
15.        switch (item.getItemId()) {
16.        case 1:
17.             Toast.makeText(this, "menu1",Toast.LENGTH_SHORT).show();            
18.            return true;
19.        case 2:
20.         
21.            return true;
22.        case 3:
23.          
24.            return true;
25.         }
26.        return false;
27.      }

4.Activity 的切換

     2個Activity 的切換,沒有數據傳遞

1. //從A到B
2. Intent intent = new Intent();
3.                  intent.setClass(A.this, B.class);
4.                  startActivity(intent);

2個Activity 之間傳遞數據

    相關的幾個函數
     startActivityForResult
    public final void setResult(int resultCode, String data)
    回調函數

    protected void onActivityResult(int requestCode, int resultCode, Intent data)

 

    例如A到B,從B得到數據  

1. //A到B
2. static final int RG_REQUEST = 0;
3. Intent intent = new Intent();
4. intent.setClass(A.this, B.class);
5. startActivityForResult(intent,RG_REQUEST);
6.                                   
7. //在B中處理
8. Bundle bundle = new Bundle();
   bundle.putString("DataKey", edittext.getText().toString());//給bundle 寫入數據
   Intent mIntent = new Intent();
   mIntent.putExtras(bundle);
   setResult(RESULT_OK, mIntent);
   finish();
9. //最后在A的回調函數里面接收數據
10. if (requestCode == RG_REQUEST) {
         if (resultCode == RESULT_CANCELED)
               setTitle("Canceled...");
         else if(resultCode == RESULT_OK) {
              setTitle((String)data.getCharSequenceExtra("DataKey"));
            }
    }

本文來自CSDN博客，轉載請標明出處：http://blog.csdn.net/sunnyclare/archive/2010/03/23/5408217.aspx