Android之带遮罩层的弹出框—popUpWindow

来源：互联网发布：linux目录结构编辑：程序博客网时间：2024/06/02 06:33

上次项目中实现了新功能，就一直想添加到博客里来着，惰性发作起来简直太可怕，不说了，跟着一起写吧，三步即可实现简单的弹出框功能，首先看效果——

首先：主页面布局，触发控件一定要有，再有就是给根标签设置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：弹出框样式设置

<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="交友需带三分侠气，做人要存一点素心\n  —《菜根谭》"        android:textColor="#000"        android:background="@drawable/layout_border" /></LinearLayout>

最后：就是主代码了

public class MainActivity extends Activity {private RelativeLayout layout;private Button btn;private boolean isFold=true;// 判断是否显示private PopupWindow taxWindow;// 弹出框private TextView tv=null;// 遮罩层    @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() {@Overridepublic 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);    // 加载弹出框的布局    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];      // 得到按钮控件的坐标，便于定位弹出框位置        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);    }}

弹出框的位置在触发控件下方居中，如果有明确的横纵坐标，可以用下面的来实现

taxWindow.showAsDropDown(anchor, xOffset, yOffset);

好了，这样就实现了。

题外话，觉得最近总是在实现小功能，对于编程理解甚少，买了两本书，快快到碗里来吧

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