你可以直接创建一个JAVA文件，命名为InputTextMsgDialog，然后把以上代码复制进去。
public class InputTextMsgDialog extends AppCompatDialog {
private Context mContext;
private InputMethodManager imm;
private EditText messageTextView;
private TextView confirmBtn;
private RelativeLayout rlDlg;
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 LinearLayout rldlgview = (LinearLayout) findViewById(R.id.rl_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);
LinearLayout ll_tv = findViewById(R.id.ll_tv);
imm = (InputMethodManager) mContext.getSystemService(Context.INPUT_METHOD_SERVICE);
ll_tv.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;
}
});
rlDlg = findViewById(R.id.rl_outside_view);
rlDlg.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (v.getId() != R.id.rl_inputdlg_view)
dismiss();
}
});
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();
}
}
布局文件 dialog_input_text_msg
btn_send_normal：
main_menu_animstyle
anim_enter_from_bottom
anim_exit_from_bottom
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。
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。