我是Android开发的初学者,我正在拼命寻找解决我在测验应用程序上遇到的挑战的解决方案。我在我的SettingsActivity
中有一个开关,它可以在另一个可见和不可见的活动中设置特定文本。然而,我一直在找到正确的逻辑从我的SettingsActivity
引用其他文本来切换其可见性。
quiz activity.Java
public class QuizActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mExplanationText = (TextView) findViewById(R.id.txtExplanation); //this is the text with which i want the visibility to be controlled from SettingsActivity
}
}
SettingsActivity.xml
<?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:paddingTop="10dp"
android:orientation="vertical">
<TextView
android:id="@+id/explanationText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:fontFamily="cursive"
android:layout_marginBottom="25dp"
android:textColor="@color/settings_text"
android:text="@string/explanation"/>
<Switch
android:id="@+id/explanationSwitch"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="end"
android:checked="true"
android:layout_gravity="center"/>
</LinearLayout>
settings activity.Java
private Switch mExplanationSwitch;
@Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_settings);
mExplanationSwitch = (Switch) findViewById(R.id.explanationSwitch);
mExplanationSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// how do i toggle visibility of mExplanation text in my QuizActivity.java from here?
}
});
}
main activity.Java
//This is where i start Quiz Activity
private Button startQuiz;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
startQuiz = (Button) findViewById(R.id.start);
startQuiz.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent startQuiz = new Intent(this, QuizActivity.class);
startActivity(beginnerIntent);
});
}
mExplanationSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
SharedPreferences preferences = getSharedPreferences("SETTINGS", MODE_PRIVATE);
Editor editor = preferences.edit();
if(isChecked){
editor.putBoolean("ntoificatoin",isChecked);
}
else
{
editor.putBoolean("ntoificatoin",isChecked);
}
editor.apply();
// how do i toggle visibility of mExplanation text in my QuizActivity.java from here?
}
});
public class QuizActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mExplanationText = (TextView) findViewById(R.id.txtExplanation); //this is the text with which i want the visibility to be controlled from SettingsActivity
SharedPreferences preferences = getSharedPreferences("SETTINGS", MODE_PRIVATE);
boolean b=preferences.getBoolean("ntoificatoin",false);//it returns stored boolean value else returns false
if(b){
//return true from Settings
//do what you want to
mExplanationText.setText(" "+b);
}
else
{
//return false from Settings
//do what you want to
mExplanationText.setText(" "+b);
}
}
}
如果您正在寻找如何将额外信息传递给QuizActivity,如何在意图中使用额外信息:
Intent intent = new Intent();
intent.putExtra("stateOfTheSwitch","clicked");
startActivity(intent);
在QuizActivity中你可以像这样检索额外的:
if(getIntent().getExtras.getString("stateOfTheSwitch").equals("clicked")
//do something
else
//do something else