上次項目中實現了新功能，就一直想添加到博客里來著，惰性發作起來簡直太可怕，不說了，跟著一起寫吧，三步即可實現簡單的彈出框功能，首先看效果——
首先：主頁面布局，觸發控件一定要有，再有就是給根標簽設置id
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/layout" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.android_popupwindow.MainActivity" > <ScrollView android:layout_width="fill_parent" android:layout_height="wrap_content" android:scrollbars="none"> <RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content"> <ImageView android:id="@+id/p" android:layout_width="fill_parent" android:layout_height="wrap_content" android:scaleType="centerCrop" android:src="@drawable/p"/> <ImageView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_below="@+id/p" android:scaleType="centerCrop" android:src="@drawable/p"/> <Button android:id="@+id/btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="click me" android:background="#fff" android:padding="10dip"/> </RelativeLayout> </ScrollView></RelativeLayout>
第二步：彈出框樣式設置
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="wrap_content" android:layout_height="wrap_content" tools:context="com.example.adf.MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:text="交友需帶三分俠氣，做人要存一點素心/n —《菜根譚》" android:textColor="#000" android:background="@drawable/layout_border" /></LinearLayout>
最后：就是主代碼了
public class MainActivity extends Activity { private RelativeLayout layout; private Button btn; private boolean isFold=true; // 判斷是否顯示 private PopupWindow taxWindow; // 彈出框 private TextView tv=null; // 遮罩層 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); layout=(RelativeLayout)findViewById(R.id.layout); btn=(Button)findViewById(R.id.btn); btn.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v){ if(isFold){ isFold=false; <span style="white-space:pre"> </span>showTaxDetail(v); tv=new TextView(MainActivity.this); <span style="white-space:pre"> </span>tv.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.FILL_PARENT)); <span style="white-space:pre"> </span>tv.setBackgroundColor(Color.parseColor("#66000000")); <span style="white-space:pre"> </span>tv.setClickable(true); <span style="white-space:pre"> </span>tv.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { isFold=true; taxWindow.dismiss(); layout.removeView(tv); } }); <span style="white-space:pre"> </span>layout.addView(tv); } else{ isFold=true; taxWindow.dismiss(); layout.removeView(tv); } } }); } private void showTaxDetail(View view){ LayoutInflater inflater=LayoutInflater.from(this); // 加載彈出框的布局 View contentView=inflater.inflate(R.layout.ewj_tax_detail, null); contentView.measure(0,0); taxWindow=new PopupWindow(contentView,contentView.getMeasuredWidth(),contentView.getMeasuredHeight(),true); //taxWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_launcher)); //taxWindow.setOutsideTouchable(true); taxWindow.setFocusable(false); int[] location = new int[2]; // 得到按鈕控件的坐標，便于定位彈出框位置 btn.getLocationInWindow(location); int taxWindowWidth=taxWindow.getContentView().getMeasuredWidth(); int screenWidth = getWindowManager().getDefaultDisplay().getWidth(); taxWindow.showAtLocation(btn,Gravity.NO_GRAVITY,(screenWidth-taxWindowWidth)/2,location[1]+95); }}彈出框的位置在觸發控件下方居中，如果有明確的橫縱坐標，可以用下面的來實現
taxWindow.showAsDropDown(anchor, xOffset, yOffset);
好了，這樣就實現了。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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