gpt4 book ai didi

java - 尝试 Intent 额外将字符串值恢复到 TextView 中

转载 作者:行者123 更新时间:2023-12-02 09:04:16 25 4
gpt4 key购买 nike

我对 android studio 编程还很陌生,似乎无法让我的应用程序将 Intent 值恢复到 TextView 中。

我有一个问题 Activity ,向用户询问一些问题,使用是/否单选按钮回答这些问题。从这里已经进行了高级诊断,因此诊断结果存储在问题 Activity 中的“storeintent()”方法中。问题是,当使用“restoreintents()”方法将 Intent 调用到答案 Activity 时, TextView 中不会显示任何内容。

这是问题 Activity (答案已存储,请查看评论):

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.Toast;

public class Questions extends AppCompatActivity {

private Button button2;

private RadioButton radioButton;
private RadioButton radioButton2;
private RadioButton radioButton3;
private RadioButton radioButton4;
private RadioButton radioButton5;
private RadioButton radioButton6;
private RadioButton radioButton7;
private RadioButton radioButton8;
private RadioButton radioButton9;
private RadioButton radioButton10;
private RadioButton radioButton11;
private RadioButton radioButton12;
private RadioButton radioButton13;
private RadioButton radioButton14;
private RadioButton radioButton15;
private RadioButton radioButton16;
private RadioButton radioButton17;
private RadioButton radioButton18;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_questions);

storeintent();

button2 = findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
opendiagnosis();
storeintent();
}
});

//Question 1
radioButton = findViewById(R.id.radioButton); //yes
radioButton2 = findViewById(R.id.radioButton20); //no
//Question 2
radioButton3 = findViewById(R.id.radioButton4); //yes
radioButton4 = findViewById(R.id.radioButton2); //no
//Question 3
radioButton5 = findViewById(R.id.radioButton6); //yes
radioButton6 = findViewById(R.id.radioButton5); //no
//Question 4
radioButton7 = findViewById(R.id.radioButton7); //yes
radioButton8 = findViewById(R.id.radioButton8); //no
//Question 5
radioButton9 = findViewById(R.id.radioButton9); //yes
radioButton10 = findViewById(R.id.radioButton10); //no
//Question 6
radioButton11 = findViewById(R.id.radioButton12); //yes
radioButton12 = findViewById(R.id.radioButton11); //no
//Question 7
radioButton13 = findViewById(R.id.radioButton13); //yes
radioButton14 = findViewById(R.id.radioButton14); //no
//Question 8
radioButton15 = findViewById(R.id.radioButton15); //yes
radioButton16 = findViewById(R.id.radioButton16); //no
//Question 9
radioButton17 = findViewById(R.id.radioButton17); //yes
radioButton18 = findViewById(R.id.radioButton18); //no
}

public void storeintent() {

String value="Android Studio Is TERRIBLE"; //my string to be displayed in textView16 in the answers activity
Intent i = new Intent(this, Questions.class);
i.putExtra("key",value);
startActivity(i);
}

public void opendiagnosis() {
// for all pairs: one of each pair has to be checked
boolean shouldStartNextActivity = (radioButton.isChecked() || radioButton2.isChecked())
&& (radioButton3.isChecked() || radioButton4.isChecked()) && (radioButton5.isChecked() || radioButton6.isChecked())
&& (radioButton7.isChecked() || radioButton8.isChecked())&& (radioButton9.isChecked() || radioButton10.isChecked())
&& (radioButton11.isChecked() || radioButton12.isChecked())&& (radioButton13.isChecked() || radioButton14.isChecked())
&& (radioButton15.isChecked() || radioButton16.isChecked())&& (radioButton17.isChecked() || radioButton18.isChecked());


if (shouldStartNextActivity){
Intent intent = new Intent(this, answers.class);
startActivity(intent);
} else{
Toast.makeText(getBaseContext(), "Please answer all the questions for an accurate diagnosis", Toast.LENGTH_LONG).show();
}
}

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);


savedInstanceState.putBoolean("myOption1", radioButton.isChecked());
savedInstanceState.putBoolean("myOption2", radioButton2.isChecked());
savedInstanceState.putBoolean("myOption3", radioButton3.isChecked());
savedInstanceState.putBoolean("myOption4", radioButton4.isChecked());
savedInstanceState.putBoolean("myOption5", radioButton5.isChecked());
savedInstanceState.putBoolean("myOption6", radioButton6.isChecked());
savedInstanceState.putBoolean("myOption7", radioButton7.isChecked());
savedInstanceState.putBoolean("myOption8", radioButton8.isChecked());
savedInstanceState.putBoolean("myOption9", radioButton9.isChecked());
savedInstanceState.putBoolean("myOption10", radioButton10.isChecked());
savedInstanceState.putBoolean("myOption11", radioButton11.isChecked());
savedInstanceState.putBoolean("myOption12", radioButton12.isChecked());
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);

radioButton.setChecked(savedInstanceState.getBoolean("myOption1"));
radioButton2.setChecked(savedInstanceState.getBoolean("myOption2"));
radioButton3.setChecked(savedInstanceState.getBoolean("myOption3"));
radioButton4.setChecked(savedInstanceState.getBoolean("myOption4"));
radioButton5.setChecked(savedInstanceState.getBoolean("myOption5"));
radioButton6.setChecked(savedInstanceState.getBoolean("myOption6"));
radioButton7.setChecked(savedInstanceState.getBoolean("myOption7"));
radioButton8.setChecked(savedInstanceState.getBoolean("myOption8"));
radioButton9.setChecked(savedInstanceState.getBoolean("myOption9"));
radioButton10.setChecked(savedInstanceState.getBoolean("myOption10"));
radioButton11.setChecked(savedInstanceState.getBoolean("myOption11"));
radioButton12.setChecked(savedInstanceState.getBoolean("myOption12"));

}
}

这是“答案” Activity (其中诊断旨在通过调用 Intent 来检索,但事实并非如此,请参阅所做的评论):

public class answers extends AppCompatActivity {

private Button button7;


private TextView textView;
private TextView textView2;
private TextView textView3;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_answers);

restoreintents(); //method CALLED HERE!

button7 = findViewById(R.id.button7);
button7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
reset();
}
});


textView = findViewById(R.id.textView16);
textView2 = findViewById(R.id.textView17);
textView3 = findViewById(R.id.textView18);
}

public void restoreintents() {

Bundle extras = getIntent().getExtras(); //Questions intent is called here again
if (extras != null) {
String value = extras.getString("key");
//The key argument here must match that used in the other activity

textView.setText(value); //String does not appear in textbox, it stays empty
}
}


public void reset() {
Intent intent = new Intent(this, Questions.class);
startActivity(intent);
}

}

一些帮助将不胜感激!

最佳答案

为什么不使用intent.putExtra(key, value),然后在目标 Activity 中获取这些发送的信息,并使用 getExtra(key) 函数获取它们。你可以这样做:

Intent i = new Intent(context, MyActivity.class);   
String value = "some string";
i.putExtra("KEY_STRING", value );

并在 MyActivity 中获取它:

Bundle bundle = getIntent().getExtras();
if(bundle.getString("KEY_STRING")!= null) {
String str = intent.getStringExtra("KEY_STRING");
}

关于java - 尝试 Intent 额外将字符串值恢复到 TextView 中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59947806/

25 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com