我制作了一个示例应用程序并对其进行了测试。无论您对哪个活动进行更改，它都会保存文本视图的最后状态（可见或不可见）。即使您退出并返回应用程序，它也会加载最后的状态。
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>
活动一.课堂
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);
}
});
}
}
活动二.课堂
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);
}
});
}
}
活动1lay.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>
活动2lay.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>
