Question

我是新来的。我是法国人，所以也许我的英语不是很好，对不起。

我是Android开发的初学者，我必须创建一个应用程序来完成我的学习。

我有一个名为VoeuxActivity.java的活动编号，带有8个按钮（和8个TextViews），它们在开始时都是可见的，当用户点击其中一个按钮时，由INVISIBLE改变（用户无法看到按钮）点击之后），当我退出应用程序并再次回到我的应用程序时，由于SharedPreferences和此论坛的成员，该按钮始终是不可见的。但我想现在当我点击这个名为“totoB”的按钮时，它将是不可见的，另一个按钮在另一个名为PersoActivity.java的活动2上变为可见，因为当我选择一个新角色时，第一个活动用于解锁一些被锁定的角色。活动1，它将在活动1中不可见，并将在活动2上可见，以便为战斗选择2个字符（这就是为什么有一个布尔名称“isClicked”）但我尝试使用SharedPreferences保持按钮可见第二项活动，但它根本不起作用。当一个新角色解锁后，如果我退出应用程序并再次回到我的应用程序中，新角色解锁不会保存为可见，并且他再次看不见但我希望他总是可以通过SharedPreferences看到。我在第一个活动上使用相同的按钮发布了一个法庭代码，然后在第二个活动上发布（我尝试和第一个活动一样，但我的解决方案无效），也许你可以帮我解决我的问题。

第一个活动的代码可以起作用并保存更改：

public class VoeuxActivity extends Activity {
Button totoB;
TextView totoTv;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_voeux);

    final SharedPreferences prefs = getSharedPreferences("sharedPreferences", Context.MODE_PRIVATE);

    totoB = (Button) findViewById(R.id.perso1);
    totoTv = (TextView) findViewById(R.id.perso1Text);
    totoB.setVisibility(prefs.getBoolean("isTotoBVisible", true) ? View.VISIBLE : View.INVISIBLE);
    totoTv.setVisibility(prefs.getBoolean("isTotoTVVisible", true) ? View.VISIBLE : View.INVISIBLE);

    totoB.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            prefs.edit().putBoolean("isTotoBVisible", false).apply();
            prefs.edit().putBoolean("isTotoTVVisible", false).apply();

            totoB.setVisibility(View.INVISIBLE);
            totoTv.setVisibility(View.INVISIBLE);
            Intent intentToto = new Intent(VoeuxActivity.this, JouerActivity.class);
            startActivity(intentToto);
        }
    });
}

我尝试为第二个活动做同样的事情，但这次不能正常工作，不会保存更改。

公共类PersoActivity扩展了Activity {

public static Personnage p1, p2;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_perso);

    final SharedPreferences prefs = getSharedPreferences("sharedPreferences", Context.MODE_PRIVATE);

    final Button totoPersoBtn = (Button) findViewById(R.id.perso1);
    final TextView totoPersoTv = (TextView) findViewById(R.id.perso1Text);
    totoAdversaireBtn = (Button) findViewById(R.id.adversaire1);
    totoAdversaireTv = (TextView) findViewById(R.id.adversaire1Text);
    totoPersoBtn.setVisibility(prefs.getBoolean("isTotoPersoBtnInvisible", true) ? View.INVISIBLE : View.VISIBLE);
    totoPersoTv.setVisibility(prefs.getBoolean("isTotoPersoTvInvisible", true) ? View.INVISIBLE : View.VISIBLE);

totoAdversaireBtn.setVisibility（prefs.getBoolean（“isTotoAdversaireBtnInvisible”，true）？View.INVISIBLE：View.VISIBLE）;

totoAdversaireTv.setVisibility（prefs.getBoolean（“isTotoAdversaireTvInvisible”，true）？View.INVISIBLE：View.VISIBLE）;

    if(VoeuxActivity.isClicked) {
        prefs.edit().putBoolean("isTotoPersoBtnInvisible", false).apply();
        prefs.edit().putBoolean("isTotoPersoTvInvisible", false).apply();
        prefs.edit().putBoolean("isTotoAdversaireBtnInvisible", false).apply();
        prefs.edit().putBoolean("isTotoAdversaireTvInvisible", false).apply();
        totoPersoTv.setVisibility(View.VISIBLE);
        totoPersoBtn.setVisibility(View.VISIBLE);
        totoAdversaireBtn.setVisibility(View.VISIBLE);
        totoAdversaireTv.setVisibility(View.VISIBLE);
    } else {
        totoPersoBtn.setVisibility(View.INVISIBLE);
        totoPersoTv.setVisibility(View.INVISIBLE);
        totoAdversaireBtn.setVisibility(View.INVISIBLE);
        totoAdversaireTv.setVisibility(View.INVISIBLE);
    }}}

如何在第二个活动中将Button和TextView的更改从Visible保存到Invisible？非常感谢你，如果有人可以帮助我，因为我真的不知道为什么它根本不起作用。吉格斯

Answer 1

我制作了一个示例应用并对其进行了测试。无论您进行哪些活动更改，它都会保存文本视图的最后状态（可见或不可见）。即使退出并返回应用程序，它也会加载最后一个状态。

清单文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.key.hs.invisiblebuttons">
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".Activity1"
            android:label="Test1"
            android:alwaysRetainTaskState="true"
            android:configChanges="keyboardHidden|orientation|screenSize"
            >
        <intent-filter>
            <action android:name="android.intent.action.MAIN"></action>
            <category android:name="android.intent.category.HOME"></category>
            <category android:name="android.intent.category.LAUNCHER"></category>

        </intent-filter>
        </activity>

        <activity
            android:name=".Activity2"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:hardwareAccelerated="true">
        </activity>
    </application>
</manifest>

Activity1.class

package com.key.hs.invisiblebuttons;

    import android.content.Intent;
    import android.content.SharedPreferences;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;

    /**
     * Created by Hasan on 26.04.2017.
     */

    public class  Activity1 extends AppCompatActivity {

        private boolean btn1visiblity, btn2visibility;
        private TextView tv1, tv2;
        private Button btn1, btn2, act2, reset;


        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity1lay);

            tv1= (TextView)findViewById(R.id.tv1);
            tv2=(TextView)findViewById(R.id.tv2);
            btn1= (Button)findViewById(R.id.btn1);
            btn2=(Button)findViewById(R.id.btn2);
            act2=(Button)findViewById(R.id.act2);
            reset=(Button)findViewById(R.id.reset);


            //Create or load preferences
            final SharedPreferences prefs = getSharedPreferences("sharedPreferences", MODE_PRIVATE);
            btn1visiblity = prefs.getBoolean("TV1visibility", true);
            btn2visibility = prefs.getBoolean("TV2visibility", true);

            //take into effect saved booleans
            if(btn1visiblity){
                tv1.setVisibility(View.VISIBLE);
            }else{
                tv1.setVisibility(View.INVISIBLE);
            }
            if(btn2visibility){
                tv2.setVisibility(View.VISIBLE);
            }else{
                tv2.setVisibility(View.INVISIBLE);
            }


            reset.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    final SharedPreferences prefs = getSharedPreferences("sharedPreferences", MODE_PRIVATE);
                    btn1visiblity = prefs.getBoolean("TV1visibility", true);
                    btn2visibility = prefs.getBoolean("TV2visibility", true);

                    SharedPreferences.Editor editor = prefs.edit();
                    editor.putBoolean("TV1visibility", true);
                    editor.putBoolean("TV2visibility", true);
                    editor.commit();

                    tv1.setVisibility(View.VISIBLE);
                    tv2.setVisibility(View.VISIBLE);

                }
            });

            act2.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent(Activity1.this, Activity2.class);
                    startActivity(intent);
                    finish();

                }
            });

            btn1.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //Create or load preferences
                    final SharedPreferences prefs = getSharedPreferences("sharedPreferences", MODE_PRIVATE);
                    btn1visiblity = prefs.getBoolean("TV1visibility", true);

                    //save new boolean
                    SharedPreferences.Editor editor = prefs.edit();
                    editor.putBoolean("TV1visibility", false);
                    editor.commit();
                    tv1.setVisibility(View.INVISIBLE);
                }
            });

            btn2.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //Create or load preferences
                    final SharedPreferences prefs = getSharedPreferences("sharedPreferences", MODE_PRIVATE);
                    btn2visibility = prefs.getBoolean("TV2visibility", true);

                    //save new boolean
                    SharedPreferences.Editor editor = prefs.edit();
                    editor.putBoolean("TV2visibility", false);
                    editor.commit();
                    tv2.setVisibility(View.INVISIBLE);
                }
            });

    }
    }

Activity2.class

     package com.key.hs.invisiblebuttons;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

/**
 * Created by Hasan on 26.04.2017.
 */

public class  Activity2 extends AppCompatActivity {

    private boolean btn1visiblity, btn2visibility;
    private TextView tv1, tv2;
    private Button btn1, btn2, act1, reset;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity2lay);

        tv1= (TextView)findViewById(R.id.tv1);
        tv2=(TextView)findViewById(R.id.tv2);
        btn1= (Button)findViewById(R.id.btn1);
        btn2=(Button)findViewById(R.id.btn2);
        act1=(Button)findViewById(R.id.act1);
        reset=(Button)findViewById(R.id.reset);

        //Create or load preferences
        final SharedPreferences prefs = getSharedPreferences("sharedPreferences", MODE_PRIVATE);
        btn1visiblity = prefs.getBoolean("TV1visibility", true);
        btn2visibility = prefs.getBoolean("TV2visibility", true);

        //if tvs invisible in activity1 make them visible in activity2
        if(!btn1visiblity){
            tv1.setVisibility(View.VISIBLE);
        }else{
            tv1.setVisibility(View.INVISIBLE);
        }
        if(!btn2visibility){
            tv2.setVisibility(View.VISIBLE);
        }else{
            tv2.setVisibility(View.INVISIBLE);
        }

        //resets booleans
        reset.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final SharedPreferences prefs = getSharedPreferences("sharedPreferences", MODE_PRIVATE);
                btn1visiblity = prefs.getBoolean("TV1visibility", true);
                btn2visibility = prefs.getBoolean("TV2visibility", true);

                SharedPreferences.Editor editor = prefs.edit();
                editor.putBoolean("TV1visibility", true);
                editor.putBoolean("TV2visibility", true);
                editor.commit();
                tv1.setVisibility(View.INVISIBLE);
                tv2.setVisibility(View.INVISIBLE);

            }
        });


        //go to activity1
        act1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Activity2.this, Activity1.class);
                startActivity(intent);
                finish();

            }
        });

        //makes tv1 invible
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Create or load preferences
                final SharedPreferences prefs = getSharedPreferences("sharedPreferences", MODE_PRIVATE);
                btn1visiblity = prefs.getBoolean("TV1visibility", true);

                //save new boolean
                SharedPreferences.Editor editor = prefs.edit();
                editor.putBoolean("TV1visibility", true);
                editor.commit();
                tv1.setVisibility(View.INVISIBLE);
            }
        });

        //makes tv2 invisible
        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Create or load preferences
                final SharedPreferences prefs = getSharedPreferences("sharedPreferences", MODE_PRIVATE);
                btn2visibility = prefs.getBoolean("TV2visibility", true);

                //save new boolean
                SharedPreferences.Editor editor = prefs.edit();
                editor.putBoolean("TV2visibility", true);
                editor.commit();
                tv2.setVisibility(View.INVISIBLE);
            }
        });



    }
}

activity1lay.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv1"
        android:text="example tv1"
        android:layout_alignParentStart="true"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv2"
        android:text="example tv2"
        android:layout_alignParentEnd="true"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btn2"
        android:text="TV2 invisible"
        android:layout_alignParentBottom="true"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btn1"
        android:text="TV1 invisible"
        android:layout_above="@id/btn2"/>


    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/act2"
        android:text="ACTIVITY2"
        android:layout_alignParentEnd="true"
        android:layout_centerInParent="true"></Button>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/reset"
        android:text="RESET VISIBILITY"
        android:layout_alignParentStart="true"
        android:layout_centerInParent="true"/>

</RelativeLayout>

activity2lay.xml

 <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical" android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tv1"
            android:text="example tv1"
            android:layout_centerInParent="true"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tv2"
            android:text="example tv2"
            android:layout_above="@id/tv1"
            android:layout_centerHorizontal="true"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/btn1"
            android:text="TV1 invisible"
            android:layout_above="@id/btn2"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/btn2"
            android:text="TV2 invisible"
            android:layout_alignParentBottom="true"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/act1"
            android:text="ACTIVITY1"
            android:layout_alignParentEnd="true"
            android:layout_centerInParent="true"></Button>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/reset"
            android:text="RESET VISIBILITY"
            android:layout_alignParentStart="true"
            android:layout_centerInParent="true"/>
    </RelativeLayout>

SharedPreferences保存按钮更改后单击它不可见，然后出现另一个按钮

1 个答案: