<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.panhouye.dialoginput">
  <application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>
    <activity android:name=".Main2Activity"
      android:theme="@style/Base.V7.Theme.AppCompat.Light.Dialog"></activity>
  </application>
</manifest>

package com.panhouye.dialoginput;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.view.MotionEvent;
import android.view.inputmethod.InputMethodManager;
/**
 * Created by pamhouye on 2017/4/25 0025.
 */
public class BaseActivity extends AppCompatActivity {
  @Override
  public boolean onTouchEvent(MotionEvent event) {
    // TODO Auto-generated method stub
    if(event.getAction() == MotionEvent.ACTION_DOWN){
      if(getCurrentFocus()!=null && getCurrentFocus().getWindowToken()!=null){
        InputMethodManager manager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        manager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
      }
    }
    return super.onTouchEvent(event);
  }
}

package com.panhouye.dialoginput;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends BaseActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  }
  //dialog按钮触发事件方法
  public void dialog(View view){
    Intent intent = new Intent(this,Main2Activity.class);
    startActivity(intent);
  }
}

package com.panhouye.dialoginput;
import android.os.Bundle;
import android.view.Gravity;
import android.view.Window;
import android.view.WindowManager;
public class Main2Activity extends BaseActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    //设置窗口对齐屏幕宽度
    Window win = this.getWindow();
    win.getDecorView().setPadding(0, 0, 0, 0);
    WindowManager.LayoutParams lp = win.getAttributes();
    lp.width = WindowManager.LayoutParams.MATCH_PARENT;
    lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
    lp.gravity = Gravity.CENTER;//设置对话框置顶显示
    win.setAttributes(lp);
    //设置点击外部空白处可以关闭Activity
    this.setFinishOnTouchOutside(true);
  }
}