Android更改原生Dialog的宽高

╰+攻爆jí腚メ 2022-12-05 10:23 152阅读 0赞

# Android更改原生Dialog的宽高 #

## 重点代码 ##

特别注意：需要在dialog show 之后再去设置。

if (mAlertDialog.getWindow() != null) {
                WindowManager.LayoutParams lp = mAlertDialog.getWindow().getAttributes();
                lp.width = 300; // 宽度，可根据屏幕宽度进行计算
                lp.gravity = Gravity.CENTER;
                mAlertDialog.getWindow().setAttributes(lp);
            }

## Activity ##

package com.demo.testdemo;
    
    import android.app.AlertDialog;
    import android.content.DialogInterface;
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.view.Gravity;
    import android.view.View;
    import android.view.WindowManager;
    
    public class MainActivity extends AppCompatActivity {
    
        private final String TAG = "MainActivity";
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
        }
    
    
        /**
         * Dialog 显示方式一
         */
        public void DialogTest1(View view) {
            AlertDialog mAlertDialog = new AlertDialog.Builder(this)
                    .setTitle("标题")
                    .setMessage("内容").setCancelable(false)
                    .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                        }
                    })
                    .setPositiveButton("确认", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                        }
                    }).show();
            // 先显示，再更改宽高；否则设置属性不成功
            if (mAlertDialog.getWindow() != null) {
                WindowManager.LayoutParams lp = mAlertDialog.getWindow().getAttributes();
                lp.width = 300; // 宽度，可根据屏幕宽度进行计算
                lp.gravity = Gravity.CENTER;
                mAlertDialog.getWindow().setAttributes(lp);
            }
        }
    
        /**
         * Dialog 显示方式二
         */
        public void DialogTest2(View view) {
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("标题");
            builder.setMessage("内容");
            builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                }
            });
            builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
    
                }
            });
            AlertDialog mAlertDialog = builder.create();
            mAlertDialog.show();
            // 先显示，再更改宽高；否则设置属性不成功
            if (mAlertDialog.getWindow() != null) {
                WindowManager.LayoutParams lp = mAlertDialog.getWindow().getAttributes();
                lp.width = 500; // 宽度，可根据屏幕宽度进行计算
                lp.gravity = Gravity.CENTER;
                mAlertDialog.getWindow().setAttributes(lp);
            }
        }
    }

## layout ##

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:context=".MainActivity">
    
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="DialogTest1"
            android:text="DialogTest1" />
    
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="DialogTest2"
            android:text="DialogTest2" />
    
    </LinearLayout>