使用AlertDialog创建应用程序主题设置

分类：编程问答

如何解决使用AlertDialog创建应用程序主题设置

我正在尝试使用暗模式的3个选项创建AlertDialog：亮，暗和系统默认设置（就像Google Apps中的选项一样） 另外，我正在使用SharedPreferences保存用户选择。 我正在使用Theme.AppCompat.DayNight 我不知道为什么，但是MODE_NIGHT_FOLLOW_SYSTEM中的主题不起作用 同样，退出应用程序并返回（或终止应用程序）时，AlertDialog显示正确的选项，但主题不正确。

这是我的代码：

package com.example.myapplication;

import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.app.AppCompatDelegate;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageButton;
import android.widget.Switch;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private CheckBox targetSel;
    private CheckBox timeOnTarget;
    private CheckBox Yield;
    private Button launch;
    private ImageButton mImageButton;
    private Switch missSwitch;
    private Switch miss1;
    private Switch miss2;
    private Switch miss3;
    private TextView screen;
    private final String MODE="themeState";
    private CountDownTimer countDownTimer;
    private ProgressDialog progressDialog;
    private AlertDialog.Builder mAlertDialog;
    private int progress=0;




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        targetSel=findViewById(R.id.checkBox);
        timeOnTarget=findViewById(R.id.checkBox2);
        Yield=findViewById(R.id.checkBox3);
        launch=findViewById(R.id.button);
        mImageButton=findViewById(R.id.imageButton2);
        missSwitch=findViewById(R.id.switch1);
        miss1=findViewById(R.id.switch3);
        miss2=findViewById(R.id.switch4);
        miss3=findViewById(R.id.switch5);
        screen=findViewById(R.id.textView2);
        countDownTimer=new CountDownTimer(11000,1000) {
             @Override
             public void onTick(long millisUntilFinished) {
                 screen.setText("t-"+millisUntilFinished/1000);
             }

             @Override
             public void onFinish() {
                 screen.setText("Click launch button");
                 launch.setEnabled(true);
             }
         };
         missSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
                 if (targetSel.isChecked() && timeOnTarget.isChecked() && Yield.isChecked() && missSwitch.isChecked()){
                     countDownTimer.start();
                     miss1.setVisibility(View.VISIBLE);
                     miss2.setVisibility(View.VISIBLE);
                     miss3.setVisibility(View.VISIBLE);
                 }
                 else{
                     countDownTimer.cancel();
                     screen.setText("");
                     miss1.setVisibility(View.INVISIBLE);
                     miss2.setVisibility(View.INVISIBLE);
                     miss3.setVisibility(View.INVISIBLE);
                     miss1.setChecked(false);
                     miss2.setChecked(false);
                     miss3.setChecked(false);
                     launch.setEnabled(false);

                 }
             }

         });
         //missile 1 Listener
         miss1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
                 if (miss1.isChecked()) {
                     progressDialog = new ProgressDialog(MainActivity.this);
                     progressDialog.setTitle("Missile 1 loading");
                     progressDialog.setMessage("arming...");
                     progressDialog.setProgressStyle(progressDialog.STYLE_HORIZONTAL);
                     progressDialog.show();
                     progressDialog.setCancelable(false);
                     new Thread(new Runnable() {
                         @Override
                         public void run() {
                             while (progress < 100) {
                                 {
                                     try {
                                         Thread.sleep(10);
                                         progress++;
                                         progressDialog.setProgress(progress);
                                     } catch (InterruptedException e) {
                                         e.printStackTrace();
                                     }
                                 }
                             }
                             if (progress == 100) {
                                 progressDialog.dismiss();
                                 progress = 0;
                             }
                         }
                     }).start();
                 }
                 else{

                 }
             }
         });

        //missile 2 Listener
        miss2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
                if (miss2.isChecked()) {
                    progressDialog = new ProgressDialog(MainActivity.this);
                    progressDialog.setTitle("Missile 2 loading");
                    progressDialog.setMessage("arming...");
                    progressDialog.setProgressStyle(progressDialog.STYLE_HORIZONTAL);
                    progressDialog.show();
                    progressDialog.setCancelable(false);
                    new Thread(new Runnable() {
                        @Override
                        public void run() {
                            while (progress < 100) {
                                {
                                    try {
                                        Thread.sleep(10);
                                        progress++;
                                        progressDialog.setProgress(progress);
                                    } catch (InterruptedException e) {
                                        e.printStackTrace();
                                    }
                                }
                            }
                            if (progress == 100) {
                                progressDialog.dismiss();
                                progress = 0;
                            }
                        }
                    }).start();
                }
                else{

                }
            }
        });

        //missile 3 Listener
        miss3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {
                if (miss3.isChecked()) {
                    progressDialog = new ProgressDialog(MainActivity.this);
                    progressDialog.setTitle("Missile 3 loading");
                    progressDialog.setMessage("arming...");
                    progressDialog.setProgressStyle(progressDialog.STYLE_HORIZONTAL);
                    progressDialog.show();
                    progressDialog.setCancelable(false);
                    new Thread(new Runnable() {
                        @Override
                        public void run() {
                            while (progress < 100) {
                                {
                                    try {
                                        Thread.sleep(10);
                                        progress++;
                                        progressDialog.setProgress(progress);
                                    } catch (InterruptedException e) {
                                        e.printStackTrace();
                                    }
                                }
                            }
                            if (progress == 100) {
                                progressDialog.dismiss();
                                progress = 0;
                            }
                        }
                    }).start();
                }
                else{

                }
            }
        });


        launch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if ( (miss1.isChecked() && !miss2.isChecked() && !miss3.isChecked() ) || (!miss1.isChecked() && miss2.isChecked() && !miss3.isChecked() ) || (!miss1.isChecked() && !miss2.isChecked() && miss3.isChecked())){
                 mAlertDialog =new AlertDialog.Builder(MainActivity.this);
                 mAlertDialog.setMessage("Missile launched");
                 mAlertDialog.show();
                 mAlertDialog.setCancelable(true);
                }
                else if (!miss1.isChecked() && !miss2.isChecked() && !miss3.isChecked()){
                    mAlertDialog=new AlertDialog.Builder(MainActivity.this);
                    mAlertDialog.setMessage("No Missile selected,aborting mission");
                    mAlertDialog.show();
                    mAlertDialog.setCancelable(true);
                }
                else{
                    mAlertDialog=new AlertDialog.Builder(MainActivity.this);
                    mAlertDialog.setMessage("Missiles launched");
                    mAlertDialog.show();
                    mAlertDialog.setCancelable(true);

                }
            }
        });

        mImageButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mAlertDialog=new AlertDialog.Builder(MainActivity.this);
                mAlertDialog.setTitle("Theme");
                mAlertDialog.setSingleChoiceItems(R.array.themeList,loadSetting(),new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog,int which) {
                            if(which==0){
                                saveSetting(MODE,0);
                              themeChange(0);
                            }
                            else if (which==1){
                                saveSetting(MODE,1);
                                themeChange(1);
                            }
                            else{
                               saveSetting(MODE,2);
                               themeChange(2);

                            }

                    }
                });
                mAlertDialog.show();
            }
        });

         }
         private void saveSetting(String s,int id){
            SharedPreferences pref= PreferenceManager.getDefaultSharedPreferences(this);
             SharedPreferences.Editor editor=pref.edit();
             editor.putInt(s,id);
             editor.apply();
         }

         private int loadSetting(){
             SharedPreferences pref= PreferenceManager.getDefaultSharedPreferences(this);
             return pref.getInt(MODE,2);
         }
         private void themeChange(int id){
           switch (id){
               case 0:
                   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
                   getDelegate().applyDayNight();
               case 1:
                   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
                   getDelegate().applyDayNight();
               case 2:
                   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
                   getDelegate().applyDayNight();
               default:
                   AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
                   getDelegate().applyDayNight();
           }

         }
}
``

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