封裝自定義的Dialog和Toast

 Dialog與Toast封裝

封裝一種自定義的AlertDialog 和 Toast.

public class CustomDialog {
private AlertDialog.Builder builder;
private Context context;
public CustomDialog(Context context) {
<span style="white-space:pre">	</span>this.context = context;
}
public void createDialog(String buttontext, String title, String message,
<span style="white-space:pre">		</span>final CallBack callBack) {
<span style="white-space:pre">	</span>builder = new AlertDialog.Builder(context);
<span style="white-space:pre">	</span>builder.setTitle(title);
<span style="white-space:pre">	</span>builder.setMessage(message);
<span style="white-space:pre">	</span>builder.setPositiveButton(buttontext, new OnClickListener() {
<span style="white-space:pre">	</span>public void onClick(DialogInterface arg0, int arg1) {
<span style="white-space:pre">		</span>callBack.isConfirm(true);
<span style="white-space:pre">		</span>}
<span style="white-space:pre">	</span>});
<span style="white-space:pre">	</span>builder.create().show();
}
public interface CallBack {
<span style="white-space:pre">	</span>public void isConfirm(boolean flag);
}
public void createToasts(String message,LayoutInflater layoutInflater) {
<span style="white-space:pre">	</span>// Toast.makeText(context, message, Toast.LENGTH_LONG).show();
    View view = layoutInflater.inflate(R.layout.toast, null);
    TextView textView = (TextView)view.findViewById(R.id.text);
    textView.setText(message);    
    Toast toast = new Toast(context);
    toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
    toast.setDuration(Toast.LENGTH_LONG);
    toast.setView(view);
    toast.show();
<span style="white-space:pre">	</span>}
}
           

這裡定義了一個内部接口，接口定義了一個isConfirm方法，含有一個 flag 變量，用來記錄是否按下 确定按鈕。

在MainActivity中調用它們：

<span style="font-family:Microsoft YaHei;">button.setOnClickListener(new View.OnClickListener() {
	public void onClick(View arg0) {
	CustomDialog dialog = new CustomDialog(MainActivity.this);
	dialog.createDialog("确定", "提示", "您确定要删除嗎？", new CallBack() {
		public void isConfirm(boolean flag) {
			System.out.println("----->>" + flag);
			if (flag) {
				//dosomething.....判斷執行業務邏輯
			}
		}
	});
	}
});
button2.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
        CustomDialog dialog = new CustomDialog(MainActivity.this);
        dialog.createToasts("網絡有有異常!!",getLayoutInflater());
        
		}
	});
}
           

<span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;"> Android的對話框有兩種：PopupWindow和AlertDialog。</span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;"> </span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">它們的不同點在于：AlertDialog的位置固定，而PopupWindow的位置可以随意</span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">AlertDialog是非阻塞線程的，AlertDialog彈出的時候，背景可是還可以做其他事情的哦。 </span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">而PopupWindow是阻塞線程的, 這就意味着在我們退出這個彈出框之前，程式會一直等待</span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">PopupWindow的位置按照有無偏移分，可以分為偏移和無偏移兩種；按照參照物的不同，可以分為相對于某個控件（Anchor錨）和相對于父控件。具體如下</span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">showAsDropDown(View anchor)：相對某個控件的位置（正左下方），無偏移</span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">showAsDropDown(View anchor, int xoff, int yoff)：相對某個控件的位置，有偏移</span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">showAtLocation(View parent, int gravity, int x, int y)：相對于父控件的位置（例如正中央Gravity.CENTER，下方Gravity.BOTTOM等），可以設定偏移或無偏移 </span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">LayoutInflater layoutInflater = LayoutInflater.from(this);</span><br style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;" /><span style="font-family: 'Microsoft YaHei'; font-size: 14px; line-height: 26px;">View popupWindow = layoutInflater.inflate(R.layout.popup, null);</span>