android通过toast实现悬浮通知效果，如图：

image.png

实现的功能：

• 自定义悬浮弹窗；
• 点击其他地方该布局不受影响；
• 可自定义显示时间；
• 可以设置点击事件；

代码如下：

import android.content.Context;
import android.os.Build;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import cn.droidlover.xdroidmvp.router.Router;
import io.slife.wallet.R;
import io.slife.wallet.config.IntentKey;
import io.slife.wallet.ui.NewsFlashDetailActivity;

public class PushToast {
private AppCompatActivity mActivity;
private static PushToast mInstance;
private Toast mToast;
private final int SHOW = 1;
private final int HIDE = 0;
private Object mTN;
private Method mShow;
private Method mHide;
private Field mViewFeild;
private long durationTime = 5*1000;

public static PushToast getInstance() {
    if (mInstance == null) {
        mInstance = new PushToast();
    }
    return mInstance;
}

public void init(AppCompatActivity activity) {
    mActivity = activity;
}

public void createToast(String title, String content, Map<String,String> params) {
    if (mActivity == null) {
        return;
    }
    LayoutInflater inflater = mActivity.getLayoutInflater();//调用Activity的getLayoutInflater()
//        LayoutInflater inflater = (LayoutInflater) context.getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = inflater.inflate(R.layout.view_push_toast, null); //加載layout下的布局
    LinearLayout llPushContent = (LinearLayout) view.findViewById(R.id.ll_push_content);
    TextView tvTitle = (TextView) view.findViewById(R.id.tv_title);
    TextView tvContent = (TextView) view.findViewById(R.id.tv_content);
    tvTitle.setText(title);
    tvContent.setText(content);
    mToast = new Toast(mActivity);
    mToast.setView(view);
    mToast.setDuration(Toast.LENGTH_LONG);
    mToast.setGravity(Gravity.TOP, 0, 0);
    reflectEnableClick();
    reflectToast();
    llPushContent.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String newsFlashId = params.get("InformationID");
            Router.newIntent(mActivity).to(NewsFlashDetailActivity.class).putString(IntentKey.NEWS_FLASH_ID,newsFlashId).launch();
            handler.sendEmptyMessage(HIDE);
        }
    });
    if(mShow != null && mHide != null){
        handler.sendEmptyMessage(SHOW);
    }else{
        mToast.show();
    }
}

private void reflectEnableClick() {
    try {
        Object mTN;
        mTN = getField(mToast, "mTN");
        if (mTN != null) {
            Object mParams = getField(mTN, "mParams");
            if (mParams != null
                    && mParams instanceof WindowManager.LayoutParams) {
                WindowManager.LayoutParams params = (WindowManager.LayoutParams) mParams;
                //显示与隐藏动画
//                    params.windowAnimations = R.style.ClickToast;
                //Toast可点击
                params.flags = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                        | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
                //设置viewgroup宽高
                params.width = WindowManager.LayoutParams.MATCH_PARENT; //设置Toast宽度为屏幕宽度
                params.height = WindowManager.LayoutParams.WRAP_CONTENT; //设置高度
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

/**
 * 反射字段
 *
 * @param object    要反射的对象
 * @param fieldName 要反射的字段名称
 */
private static Object getField(Object object, String fieldName)
        throws NoSuchFieldException, IllegalAccessException {
    Field field = object.getClass().getDeclaredField(fieldName);
    if (field != null) {
        field.setAccessible(true);
        return field.get(object);
    }
    return null;
}

private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        switch (msg.what) {
            case SHOW:
                handler.sendEmptyMessageDelayed(HIDE, durationTime);
                show();
                break;
            case HIDE:
                hide();
                break;
        }
    }
};

public void reflectToast() {
    Field field = null;
    try {
        field = mToast.getClass().getDeclaredField("mTN");
        field.setAccessible(true);
        mTN = field.get(mToast);
        mShow = mTN.getClass().getDeclaredMethod("show");
        mHide = mTN.getClass().getDeclaredMethod("hide");
        mViewFeild = mTN.getClass().getDeclaredField("mNextView");
        mViewFeild.setAccessible(true);
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e1) {
        e1.printStackTrace();
    }
}

public void show() {
    try {
        //android4.0以上就要以下处理
        if (Build.VERSION.SDK_INT > 14) {
            Field mNextViewField = mTN.getClass().getDeclaredField("mNextView");
            mNextViewField.setAccessible(true);
            LayoutInflater inflate = (LayoutInflater) mActivity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View v = mToast.getView();
            mNextViewField.set(mTN, v);
            Method method = mTN.getClass().getDeclaredMethod("show", null);
            method.invoke(mTN, null);
        }
        mShow.invoke(mTN, null);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

private void hide() {
    try {
        mHide.invoke(mTN, null);
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    }catch (NullPointerException ex){
        ex.printStackTrace();
    }
}
}

xml布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ll_push_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/bg_push_message"
android:orientation="vertical">
<TextView
    android:id="@+id/tv_title"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textColor="@color/black"
    android:text="标题"
    android:maxLines="2"
    android:ellipsize="end"
    android:textStyle="bold"
    android:textSize="@dimen/text_size_14" />
<TextView
    android:id="@+id/tv_content"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textColor="@color/black_808080"
    android:textSize="@dimen/text_size_13"
    android:maxLines="3"
    android:ellipsize="end"
    android:layout_marginTop="@dimen/margin_large"
    android:text="1"/>

</LinearLayout>

点九格式图片：

bg_push_message.9.png

使用方法：
activity中需要初始化一次：

PushToast.getInstance().init(this);

调用：

PushToast.getInstance().createToast(msg.title,msg.text,umengPushEntity.getExtraMap());