Question

我有Button In片段，我已设置按钮的初始颜色为绿色，按钮点击后我将按钮颜色设置为红色，但是当我滑动并转到另一个片段并且在第一个片段出现后，按钮颜色设置初始颜色不是红色请帮助，关闭我的应用程序并重新启动应用程序后，颜色为初始颜色。

点击

这是我的Code For按钮

@Override
public void onClick(View v) {
    switch (v.getId()) {

        case R.id.table1:

                btnColor = (ColorDrawable) table1.getBackground();
                colorId = btnColor.getColor();
                if (colorId == getResources().getColor(R.color.colorAcce)) {
                    String value = table1.getText().toString();
                    Intent intent = new Intent(getActivity(), TakeOrderActivity.class);
                    intent.putExtra("myString", value);
                    startActivity(intent);
                    table1.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAccent));

            }else
            {
                ((MainActivity)getActivity()).navigateFragment(1);
            }

            break;
        case R.id.table2:
            btnColor = (ColorDrawable) table2.getBackground();
            colorId = btnColor.getColor();
            if (colorId == getResources().getColor(R.color.colorAcce)){
            String value1 = table2.getText().toString();
            Intent intent1 = new Intent(getActivity(), TakeOrderActivity.class);
            intent1.putExtra("myString", value1);
            startActivity(intent1);
            table2.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAccent));
            }else
            {
                ((MainActivity)getActivity()).navigateFragment(1);
            }
            break;
}

这是经过编辑的代码

public String getButtonState(int id) {
   SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getActivity());
   return pref.getString("btn"+id, "not_clicked");
}

public void setButtonState(int id,String state) {
    SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getActivity());
    SharedPreferences.Editor editor = pref.edit();
    editor.putString("btn"+id, state);
    editor.commit();
}
@Override
public void onResume() {
    if(getButtonState(R.id.table1).equals("clicked")){
        table1.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAcce));
    } else {
        table1.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAccent));

    }
    if(getButtonState(R.id.table2).equals("clicked")){
        table2.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAcce));
    } else {
        table2.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAccent));
    }
    if(getButtonState(R.id.table9).equals("clicked")){
        table9.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAccent));
    } else {
        table9.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAcce));
    }
    if(getButtonState(R.id.table11).equals("clicked")){
        table11.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAccent));
    } else {
        table11.setBackgroundColor(getActivity().getResources().getColor(R.color.colorAcce));
    }
    super.onResume();
}

Answer 1

为此，您需要将按钮的状态保存在存储中。我建议你使用SharedPreferences

的简单解决方法

使用方法setButtonState(R.id.button1, "clicked")将按钮状态存储在sharedPreference中。

现在每当onResume()调用片段加载值形成SharedPreferences时。

public String getButtonState(int id) {
    SharedPreferences pref; = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
    return pref.getString("btn"+id, "not_clicked");
}

public void setButtonState(int id,String state) {
    SharedPreferences pref; = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
    Editor editor = pref.edit();
    editor.putString("btn"+id, state);
    editor.commit();
}

现在在片段

的onResume（）中写这个

if(getButtonState(R.id.button1).equals("clicked")){
    //apply clicked button color
} else {
    //apply another color
}

Answer 2

当您单击按钮时，在SharedPreferences中存储Button的颜色，每当您再次使用该相同的片段时，使用SharedPreferences存储的颜色状态将Button的颜色从初始（绿色）更改为红色。

点击按钮：

SharedPreferences preferences = getSharedPreferences("AppName", Activity.MODE_PRIVATE);
Editor editor = preferences.edit();
editor = editor.putString("BUTTON_COLOR", "Red").commit();

检查UI可见性：

if(preferences.getString("BUTTON_COLOR", "").equalsIgnorCase("Red")){
//Set button color to Red
}else{
//Set button color to green
}

e.g。在片段中查看此内容。根据您的代码，当您单击该按钮时，您将缺少设置颜色状态。只是试图获得onResume中的颜色状态，你将如何直接设置任何东西。检查下面的一个完成。

//Variables
private SharedPreferences preferences;
private Editor editor;
private Button btnClickMe;

//In onCreate of fragment
preferences = getSharedPreferences("AppName", Activity.MODE_PRIVATE);
editor = preferences.edit();

//In onCreateView of fragment
btnClickMe = (Button) findViewById(R.id.btnClickMe);
btnClickMe.setOnClickListener(this);

@Override
    protected void onResume() {
        super.onResume();
        if(preferences.getString("BUTTON_COLOR", "Green").equalsIgnoreCase("Green")){
            btnClickMe.setBackgroundColor(getResources().getColor(R.color.green));
        }else{
            btnClickMe.setBackgroundColor(getResources().getColor(R.color.red));
        }
    }

@Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.btnClickMe:
            if((((ColorDrawable)btnClickMe.getBackground()).getColor()) == getResources().getColor(R.color.red)){
                //navigate to activity
                editor.putString("BUTTON_COLOR", "Green").commit();
                btnClickMe.setBackgroundColor( getResources().getColor(R.color.green));
            }else{
                //navigate to fragment
                editor.putString("BUTTON_COLOR", "Red").commit();
                btnClickMe.setBackgroundColor( getResources().getColor(R.color.red));
            }
            break;
        default:
            break;
        }
    }

按钮单击后在片段中设置按钮背景颜色

2 个答案: