Android 使用PopupWindow自定义气泡弹窗

作为一个菜鸟突然想了解一下气泡弹窗，于是查找资料就写了一个简单的弹窗PopupWindow，

个人感觉符合菜鸟的水平;

 

一.首先自定义好气泡框

public class MyLinear extends LinearLayout {

    private Paint paint;
    //view的宽高
    int widthSize;
    int heightSize;

    public MyLinear(Context context) {
        super(context);
        init();
    }

    public MyLinear(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyLinear(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        paint = new Paint();
        paint.setAntiAlias(true);//设置抗锯齿
        //设置是否抖动，如果不设置感觉就会有一些僵硬的线条，如果设置图像就会看的更柔和一些，
        paint.setDither(true);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);//填充内部和描边
        paint.setColor(getResources().getColor(R.color.bg));
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int specMode = MeasureSpec.getMode(widthMeasureSpec);
        int specSize = MeasureSpec.getSize(widthMeasureSpec);
        int specModeh = MeasureSpec.getMode(heightMeasureSpec);
        int specSizeh = MeasureSpec.getSize(heightMeasureSpec);

        if (specMode == MeasureSpec.AT_MOST) {//设置为wrap_content
            widthSize =300;
        } else if (specMode == MeasureSpec.EXACTLY) {//相当于我们设置为match_parent或者为一个具体的值
            widthSize = specSize;
        }
        if (specModeh == MeasureSpec.AT_MOST) {
            heightSize =400;
        } else if (specModeh == MeasureSpec.EXACTLY) {//相当于我们设置为match_parent或者为一个具体的值
            heightSize = specSizeh;
        }
        /*widthSize = specSize;
        heightSize = specSizeh;*/
        setMeasuredDimension(widthSize, heightSize);
    }


    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        //画矩形
        RectF rectF = new RectF(0,20,widthSize,heightSize);
        canvas.drawRoundRect(rectF,10,10,paint);
        //画三角形（这里是基于path路径的绘制）
        Path path = new Path();
        Log.d("width", "onDraw: "+widthSize);
        Log.d("width", "onDrawh: "+heightSize);
        path.moveTo(widthSize-25, 0);
        path.lineTo(widthSize-10, 20);
        path.lineTo(widthSize-40, 20);
        path.close();
        canvas.drawPath(path, paint);
        canvas.save();
    }
}

 

二。创建xml布局popu_menu.xml文件，进行气泡框布局

    
//listview是为了好加载选项
        

        
    

2.1弹窗样式如下:

至于弹窗的大小与位置，注意上面的onMesure（）方法

 

 

 

三。建立item布局list_item.xml加载

 

3.1，加载item数据源:至于Datas数据类自己建

package com.example.dell.mypopupwindows.adapter;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.dell.mypopupwindows.Datas;
import com.example.dell.mypopupwindows.R;

import java.util.ArrayList;

public class ItemAdapter extends BaseAdapter {

    private ArrayList arrayList;

    public ItemAdapter(ArrayList arrayList){
        this.arrayList = arrayList;
    }

    @Override
    public int getCount() {
        return arrayList.size();
    }

    @Override
    public Object getItem(int i) {
        return null;
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public View getView(int i, View convertView, ViewGroup viewGroup) {
        View view = null;
        ViewHolder viewHolder = new ViewHolder();
        if (convertView == null) {
            view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item,viewGroup,false);
            viewHolder.tv1 = view.findViewById(R.id.tv);
            viewHolder.img1 = view.findViewById(R.id.img);
            view.setTag(viewHolder);

        } else {
            view = convertView;
            viewHolder = (ViewHolder) view.getTag();
        }
        viewHolder.tv1.setText(arrayList.get(i).getTv());
        viewHolder.img1.setImageResource(arrayList.get(i).getImg());
        return view;
    }

    private class ViewHolder {
        TextView tv1;
        ImageView img1;

    }
}

 

 

四。建立弹窗：

public class MyPopup extends PopupWindow {
    private Context context;
    private View view;
    private ListView listView;
    private ArrayList arrayList;

    public MyPopup(Context context,View parent) {
       super(context);
       this.context = context;
       //设置弹窗大小
        setWidth(300);
        setHeight(400);
        //设置可以获得焦点
        setFocusable(true);
        //设置弹窗内可点击
        setTouchable(true);
        //设置弹窗外可点击
        setOutsideTouchable(true);
       //背景
        setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
       or// setBackgroundDrawable(new BitmapDrawable());
        //加载弹窗布局
        view = LayoutInflater.from(context).inflate(R.layout.popu_menu,null);
        setContentView(view);
        //建立弹窗内容
        initData();
        //显示弹窗, 第一个参数是PopupWindow的锚点，第二和第三个参数分别是PopupWindow相对锚点的x、y偏移
        showAsDropDown(parent , 0, 0);
       // showAtLocation(parent, Gravity.BOTTOM, 0, 0);

    }

    private void initData() {

        listView= view.findViewById(R.id.listview1);
        arrayList = new ArrayList<>();
        arrayList.add(new Datas("弹窗",R.mipmap.ic_launcher));
        arrayList.add(new Datas("弹窗2",R.mipmap.ic_launcher));
        arrayList.add(new Datas("弹窗3",R.mipmap.ic_launcher));

        listView.setAdapter(new ItemAdapter(arrayList));
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView adapterView, View view, int i, long l) {
                ///Toast.makeText(context,"点击："+arrayList.get(i).getTv(),Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(context, SecondActivitv.class);
                context.startActivity(intent);
            }
        });

    }
}

注意：如果不设置PopupWindow的背景，有些版本就会出现一个问题：无论是点击外部区域还是Back键都无法dismiss弹框
 setOutsideTouchable(true); 
setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

 

五。MainActivity文件：

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private ArrayList arrayList;
    private TextView mainTv;
    private LinearLayout linearLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
   
        mainTv = findViewById(R.id.maintv);
        mainTv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {       
                new MyPopup(MainActivity.this,view);//在需要的地方加载
            }
        });
    }
}
如图：点击helloworld发生变化

 

参考链接 ：1.https://blog.csdn.net/caicdd007/article/details/51933656

2.https://www.cnblogs.com/jzyhywxz/p/7039503.html