android 评论输入框（PopupWindow）

1、先定义一个按钮（activity_main）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/main_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="评论"/>


</LinearLayout>

2、定义一个弹出框布局（popuwindow）

<?xml version="1.0" encoding="utf-8"?>
<citycircle.com.face.FaceRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <LinearLayout
        android:id="@+id/ll_input"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:background="@android:color/white"
        android:orientation="horizontal"
        android:paddingLeft="12dp"
        android:paddingRight="12dp">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="6dp"
            android:layout_weight="1"
            android:background="@drawable/shape_bg_white_pinglun"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            android:paddingLeft="5dp"
            android:paddingRight="5dp">

            <EditText
                android:id="@+id/et_sendmessage"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@null"
                android:gravity="center_vertical"
                android:hint=""
                android:maxLines="4"
                android:minHeight="28dp"
                android:paddingLeft="12dp"
                android:paddingRight="12dp"
                android:text=""
                android:textColor="@android:color/black"
                android:textColorHint="#cccccc"
                android:textSize="16sp" />

            <ImageButton
                android:id="@+id/btn_face"
                android:layout_width="26dp"
                android:layout_height="26dp"
                android:layout_gravity="center_vertical"
                android:background="@null"
                android:scaleType="centerCrop"
                android:src="@mipmap/ic_biaoqing"
                android:visibility="visible" />

        </LinearLayout>

        <TextView
            android:id="@+id/btn_send"
            android:layout_width="48dp"
            android:layout_height="match_parent"
            android:layout_gravity="right|center_vertical"
            android:layout_marginRight="8dp"
            android:gravity="center"
            android:text="发布"
            android:textColor="@android:color/darker_gray"
            android:textSize="18sp" />
    </LinearLayout>
    <RelativeLayout
        android:id="@+id/ll_facechoose"
        android:layout_width="fill_parent"
        android:layout_height="124dp"
        android:layout_below="@id/ll_input"
        android:background="#f6f5f5"
        android:visibility="gone">

        <android.support.v4.view.ViewPager
            android:id="@+id/vp_contains"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </android.support.v4.view.ViewPager>

        <LinearLayout
            android:id="@+id/iv_image"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="6dip"
            android:gravity="center"
            android:orientation="horizontal" >
        </LinearLayout>
    </RelativeLayout>
</citycircle.com.face.FaceRelativeLayout>

3、主要代码（MainActivity）

import android.app.ActionBar;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.PopupWindow;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private PopupWindow mPopWindow;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button button = findViewById(R.id.main_btn);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showPopupWindow();
            }
        });
    }

    private void showPopupWindow() {
        //设置contentView
        View contentView = LayoutInflater.from(MainActivity.this).inflate(R.layout.popup, null);
        mPopWindow = new PopupWindow(contentView,
                ActionBar.LayoutParams.MATCH_PARENT, ActionBar.LayoutParams.WRAP_CONTENT, true);
        mPopWindow.setContentView(contentView);
        //防止PopupWindow被软件盘挡住（可能只要下面一句，可能需要这两句）
//        mPopWindow.setSoftInputMode(PopupWindow.INPUT_METHOD_NEEDED);
        mPopWindow.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        //设置软键盘弹出
        InputMethodManager inputMethodManager = (InputMethodManager) getApplicationContext().getSystemService(Context.INPUT_METHOD_SERVICE);
        inputMethodManager.toggleSoftInput(1000, InputMethodManager.HIDE_NOT_ALWAYS);//这里给它设置了弹出的时间
        //设置各个控件的点击响应
        final EditText editText = contentView.findViewById(R.id.pop_editText);
        Button btn = contentView.findViewById(R.id.pop_btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String inputString = editText.getText().toString();
                Toast.makeText(MainActivity.this, inputString, Toast.LENGTH_SHORT).show();
                mPopWindow.dismiss();//让PopupWindow消失
            }
        });
        //是否具有获取焦点的能力
        mPopWindow.setFocusable(true);
        //显示PopupWindow
        View rootview = LayoutInflater.from(MainActivity.this).inflate(R.layout.activity_main, null);
        mPopWindow.showAtLocation(rootview, Gravity.BOTTOM, 0, 0);
    }
}