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这是一个很多app评论回复的时候 ， 经常用到的弹框。使用Dialog的方式，不会耦合布局，使用简单，可在任何地方使用。可自定义样式。

进入自动弹出输入法，发送后自动关闭输入法，设置最大输入字数，超过字数后，字体会变红 等功能。

下面是代码：

InputTextMsgDialog.java

import android.annotation.SuppressLint;

import android.content.Context;

import android.content.DialogInterface;

import android.graphics.Rect;

import android.support.annotation.NonNull;

import android.support.constraint.ConstraintLayout;

import android.support.v7.app.AppCompatDialog;

import android.text.Editable;

import android.text.TextUtils;

import android.text.TextWatcher;

import android.util.Log;

import android.view.Display;

import android.view.Gravity;

import android.view.KeyEvent;

import android.view.View;

import android.view.WindowManager;

import android.view.inputmethod.InputMethodManager;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

public class InputTextMsgDialog extends AppCompatDialog {

private Context mContext;

private InputMethodManager imm;

private EditText messageTextView;

private TextView confirmBtn;

private int mLastDiff = 0;

private TextView tvNumber;

private int maxNumber = 200;

public interface OnTextSendListener {

void onTextSend(String msg);

}

private OnTextSendListener mOnTextSendListener;

public InputTextMsgDialog(@NonNull Context context, int theme) {

super(context, theme);

this.mContext = context;

this.getWindow().setWindowAnimations(R.style.main_menu_animstyle);

init();

setLayout();

}

/**

* 最大输入字数 默认200

*/

@SuppressLint("SetTextI18n")

public void setMaxNumber(int maxNumber) {

this.maxNumber = maxNumber;

tvNumber.setText("0/" + maxNumber);

}

/**

* 设置输入提示文字

*/

public void setHint(String text) {

messageTextView.setHint(text);

}

/**

* 设置按钮的文字 默认为：发送

*/

public void setBtnText(String text) {

confirmBtn.setText(text);

}

private void init() {

setContentView(R.layout.dialog_input_text_msg);

messageTextView = (EditText) findViewById(R.id.et_input_message);

tvNumber = (TextView) findViewById(R.id.tv_test);

final ConstraintLayout rldlgview = (ConstraintLayout) findViewById(R.id.constraintLayout_inputdlg_view);

messageTextView.addTextChangedListener(new TextWatcher() {

@Override

public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

}

@Override

public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

}

@Override

public void afterTextChanged(Editable editable) {

tvNumber.setText(editable.length() + "/" + maxNumber);

if (editable.length() > maxNumber) {

/*dot_hong颜色值：#E73111,text_bottom_comment颜色值：#9B9B9B*/

tvNumber.setTextColor(mContext.getResources().getColor(R.color.dot_hong));

} else {

tvNumber.setTextColor(mContext.getResources().getColor(R.color.text_bottom_comment));

}

if (editable.length() == 0) {

confirmBtn.setBackgroundResource(R.drawable.btn_send_normal);

} else {

confirmBtn.setBackgroundResource(R.drawable.btn_send_pressed);

}

}

});

confirmBtn = (TextView) findViewById(R.id.confrim_btn);

imm = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);

confirmBtn.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

String msg = messageTextView.getText().toString().trim();

if (msg.length() > maxNumber) {

Toast.makeText(mContext, "超过最大字数限制", Toast.LENGTH_LONG).show();

return;

}

if (!TextUtils.isEmpty(msg)) {

mOnTextSendListener.onTextSend(msg);

imm.showSoftInput(messageTextView, InputMethodManager.SHOW_FORCED);

imm.hideSoftInputFromWindow(messageTextView.getWindowToken(), 0);

messageTextView.setText("");

dismiss();

} else {

Toast.makeText(mContext, "请输入文字", Toast.LENGTH_LONG).show();

}

messageTextView.setText(null);

}

});

messageTextView.setOnEditorActionListener(new TextView.OnEditorActionListener() {

@Override

public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {

switch (actionId) {

case KeyEvent.KEYCODE_ENDCALL:

case KeyEvent.KEYCODE_ENTER:

if (messageTextView.getText().length() > maxNumber) {

Toast.makeText(mContext, "超过最大字数限制", Toast.LENGTH_LONG).show();

return true;

}

if (messageTextView.getText().length() > 0) {

imm.hideSoftInputFromWindow(messageTextView.getWindowToken(), 0);

dismiss();

} else {

Toast.makeText(mContext, "请输入文字", Toast.LENGTH_LONG).show();

}

return true;

case KeyEvent.KEYCODE_BACK:

dismiss();

return false;

default:

return false;

}

}

});

messageTextView.setOnKeyListener(new View.OnKeyListener() {

@Override

public boolean onKey(View view, int i, KeyEvent keyEvent) {

Log.d("My test", "onKey " + keyEvent.getCharacters());

return false;

}

});

rldlgview.addOnLayoutChangeListener(new View.OnLayoutChangeListener() {

@Override

public void onLayoutChange(View view, int i, int i1, int i2, int i3, int i4, int i5, int i6, int i7) {

Rect r = new Rect();

//获取当前界面可视部分

getWindow().getDecorView().getWindowVisibleDisplayFrame(r);

//获取屏幕的高度

int screenHeight = getWindow().getDecorView().getRootView().getHeight();

//此处就是用来获取键盘的高度的， 在键盘没有弹出的时候 此高度为0 键盘弹出的时候为一个正数

int heightDifference = screenHeight - r.bottom;

if (heightDifference <= 0 && mLastDiff > 0) {

dismiss();

}

mLastDiff = heightDifference;

}

});

rldlgview.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

imm.hideSoftInputFromWindow(messageTextView.getWindowToken(), 0);

dismiss();

}

});

setOnKeyListener(new OnKeyListener() {

@Override

public boolean onKey(DialogInterface dialogInterface, int keyCode, KeyEvent keyEvent) {

if (keyCode == KeyEvent.KEYCODE_BACK && keyEvent.getRepeatCount() == 0)

dismiss();

return false;

}

});

}

private void setLayout() {

getWindow().setGravity(Gravity.BOTTOM);

WindowManager m = getWindow().getWindowManager();

Display d = m.getDefaultDisplay();

WindowManager.LayoutParams p = getWindow().getAttributes();

p.width = WindowManager.LayoutParams.MATCH_PARENT;

p.height = WindowManager.LayoutParams.WRAP_CONTENT;

getWindow().setAttributes(p);

setCancelable(true);

getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);

}

public void setmOnTextSendListener(OnTextSendListener onTextSendListener) {

this.mOnTextSendListener = onTextSendListener;

}

@Override

public void dismiss() {

super.dismiss();

//dismiss之前重置mLastDiff值避免下次无法打开

mLastDiff = 0;

}

@Override

public void show() {

super.show();

}

}

下面是布局文件：/layout/dialog_input_text_msg.xml

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/constraintLayout_inputdlg_view"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="@color/white">

android:id="@+id/et_input_message"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:background="@color/HomeMainBg"

android:gravity="top"

android:hint="想说点什么"

android:imeOptions="flagNoExtractUi"

android:lineSpacingMultiplier="1.2"

android:maxLength="2000"

android:maxLines="6"

android:minHeight="104dp"

android:paddingLeft="15dp"

android:paddingTop="10dp"

android:paddingRight="15dp"

android:paddingBottom="10dp"

android:scrollbars="vertical"

android:textColor="#FF333333"

android:textColorHint="@color/text_bottom_comment"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toTopOf="parent"

tools:ignore="InvalidImeActionId" />

android:layout_width="match_parent"

android:layout_height="1dp"

android:background="@color/DiscoverLine"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@id/et_input_message" />

android:id="@+id/tv_test"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center"

android:layout_marginStart="16dp"

android:layout_marginTop="10dp"

android:layout_marginBottom="10dp"

android:text="0/200"

android:textColor="@color/text_bottom_comment"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintStart_toStartOf="parent"

app:layout_constraintTop_toBottomOf="@id/et_input_message" />

android:id="@+id/confrim_btn"

android:layout_width="50dp"

android:layout_height="28dp"

android:layout_marginTop="10dp"

android:layout_marginEnd="16dp"

android:layout_marginBottom="10dp"

android:background="@drawable/btn_send_normal"

android:gravity="center"

android:text="发送"

android:textColor="@color/white"

app:layout_constraintBottom_toBottomOf="parent"

app:layout_constraintEnd_toEndOf="parent"

app:layout_constraintTop_toBottomOf="@id/et_input_message" />

/drawable/btn_send_normal.xml

android:shape="rectangle">

/drawable/btn_send_pressed.xml

android:shape="rectangle">

/values/styles.xml

main_menu_animstyle

@anim/anim_enter_from_bottom

@anim/anim_exit_from_bottom

/anim/anim_enter_from_bottom.xml

android:fromYDelta="100%"

android:toYDelta="0"

android:fillAfter="false"

android:duration="300"

/>

android:fromAlpha="0.0"

android:toAlpha="1.0"

android:duration="300"

android:fillAfter="true"/>

/anim/anim_exit_from_bottom.xml

android:fromYDelta="0"

android:toYDelta="100%"

android:fillAfter="false"

android:duration="300"

/>

android:fromAlpha="1.0"

android:toAlpha="0.0"

android:duration="300"

android:fillAfter="true"/>

使用方式：

在OnCreate方法里直接new出这个Dialog即可，在需要的地方调用show方法显示

inputTextMsgDialog = new InputTextMsgDialog(mContext, R.style.dialog_center);

inputTextMsgDialog.setmOnTextSendListener(new InputTextMsgDialog.OnTextSendListener() {

@Override

public void onTextSend(String msg) {

//点击发送按钮后，回调此方法，msg为输入的值

}

});

下面是dialog_center的代码，如果你需要让这个Dialog点击空白部分的activity时消失，背景变暗等功能，就加上这个style。

/values/styles.xml

dialog_center

@null

portrait

true

@color/transparent

true

true

API：

inputTextMsgDialog.show() //显示此dialog

inputTextMsgDialog.dismiss() //隐藏此dialog

inputTextMsgDialog.setHint() //设置输入提示文字

inputTextMsgDialog.setBtnText() //设置按钮的文字 默认为：发送

inputTextMsgDialog.setMaxNumber() //最大输入字数 默认200

注1：如果需要自定义样式，请自己写一个layout，替换dialog_input_text_msg。

注2：如果需要改变按钮颜色等，修改btn_send_normal和btn_send_pressed里的

其中，btn_send_normal为输入框内未输入文字的颜色，btn_send_pressed为输入后的颜色。