如何保存活动结束后的状态。

Question

我是android工作室的新手。我有一个活动，是设置打开和关闭音乐。当我打开音乐的时候，图像也改变了，知道音乐被关掉了。但是当我结束这个活动时，它又回到了“播放音乐”的形象。关闭活动后，如何保存先前的图像或活动状态。我需要一些保存实例，像这样的状态吗？这是我的密码

package com.example.mainmenu;


import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.DisplayMetrics;

import android.view.MotionEvent;
import android.view.View;

import android.view.WindowManager;
import android.widget.ImageView;


 public class settings extends AppCompatActivity {
 private ImageView close;
 private ImageView help;
 protected void onCreate(final Bundle savedInstanceState) {
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,         
    WindowManager.LayoutParams.FLAG_FULLSCREEN);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.custompopup);


    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);

    getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
    final ImageView sound;
    close =(ImageView) findViewById(R.id.txtclose);
    sound = (ImageView) findViewById(R.id.button_sound);
    help = (ImageView) findViewById(R.id.button_help);

    help.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent secondactivtyintent = new Intent(settings.this, 
    panuto1.class);
            startActivity(secondactivtyintent);

        }
    });
    help.setOnTouchListener(new View.OnTouchListener(){

        public boolean onTouch(View v, MotionEvent event) {
            switch(event.getAction())
            {
                case MotionEvent.ACTION_DOWN :
                    help.setImageResource(R.drawable.help);
                    break;
                case MotionEvent.ACTION_UP :
                    help.setImageResource(R.drawable.help1);
                    break;
            }
            return false;
        }

    });
    close.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            moveTaskToBack(false);
            finish();
        }
    });


    sound.setOnClickListener(new View.OnClickListener()
    {

        private boolean fun = true;
        public void onClick(View v)
        {
            if(fun)
            {
                sound.setImageResource(R.drawable.nosound);
                sound.setPressed(true);
                fun=false;
                stopService(new Intent(settings.this, 
   BackgroundSoundService.class));

                sound.setOnTouchListener(new View.OnTouchListener(){

                    public boolean onTouch(View v, MotionEvent event) {
                        switch(event.getAction())
                        {
                            case MotionEvent.ACTION_DOWN :
                                sound.setImageResource(R.drawable.nosound1);
                                break;
                            case MotionEvent.ACTION_UP :
                                sound.setImageResource(R.drawable.nosound);
                                break;

                        }
                        return false;
                    }

                });

            }
            else
            {
                fun=true;
                sound.setPressed(true);
                sound.setImageResource(R.drawable.sound);
                startService(new Intent(settings.this, 
   BackgroundSoundService.class));
                sound.setOnTouchListener(new View.OnTouchListener(){

                    public boolean onTouch(View v, MotionEvent event) {
                        switch(event.getAction())
                        {
                            case MotionEvent.ACTION_DOWN :
                                sound.setImageResource(R.drawable.sound1);
                                break;
                            case MotionEvent.ACTION_UP :
                                sound.setImageResource(R.drawable.sound);
                                break;
                        }
                        return false;

                    }

                });
            }

        }

    });

  }

 }

Answer 1

使用SharedPreference保存当前状态，在更改状态时在SharedPreference中更新值。当您从其他活动返回时，从sharedPreference获取状态并进行更改，image.you可以在onResume方法中完成此任务。