将多个值添加到textView-Android [英] Adding multiple values to a textView - Android

问题描述

我目前正在尝试制作一个包含4个切换按钮和一个textview的基本应用程序.这个想法很简单:当按下一个按钮时，文本视图将显示当前正在按下的按钮.这可以包括多个按钮(例如，如果按下了1、3和4).这是我为此编写的代码:

I'm currently trying to make a basic app that incorporates 4 toggle buttons and a textview. The idea is simple: When a button is pressed, the textview will show which buttons are currently being pressed. This can include multiple buttons (such as if, for example 1, 3, and 4 were pressed). Here's the code I've written for it:

TextView按钮；

TextView buttons;

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

    buttons = (TextView)findViewById(R.id.textView1);

    }

public void buttonPressed(View v){
    boolean check = ((ToggleButton)v).isChecked();

    int b1 = 1, b2 = 2, b3 = 3, b4 = 4;

    switch(v.getId()){
    case R.id.toggleButton1:
        if(check){
            buttons.setText("Buttons pressed: " + b1);
        }
        else{
            buttons.setText("Buttons pressed:");
        }
        break;
    case R.id.toggleButton2:
        if(check){
            buttons.setText("Buttons pressed: " + b2);
        }
        else{
            buttons.setText("Buttons pressed:");
        }
        break;
    case R.id.toggleButton3:
        if(check){
            buttons.setText("Buttons pressed: " + b3);
        }
        else{
            buttons.setText("Buttons pressed:");
        }
        break;
    case R.id.toggleButton4:
        if(check){
            buttons.setText("Buttons pressed: " + b4);
        }
        else{
            buttons.setText("Buttons pressed:");
        }
        break;
    default:
        break;

    }



}

不幸的是，每次我运行该程序时，textview都会被覆盖，并且我无法获取它来验证是否按下了多个按钮.欢迎提出所有建议.

Unfortunately, every time I run this program, the textview is overwritten, and I can't get it to validate that multiple buttons are pressed. All suggestions are welcome.

推荐答案

如果您希望textview总是显示ON按钮的数量，我想您可以这样做:

If you want your textview always show number of ON buttons, I think you can do this way :

保持按钮的轨迹

private ToggleButton[] btns = new ToggleButton[4];

在onCreate()中:

In onCreate():

btn[0] = (ToggleButton)findViewById(R.id.toggleButton1);
btn[1] = (ToggleButton)findViewById(R.id.toggleButton2);
btn[2] = (ToggleButton)findViewById(R.id.toggleButton3);
btn[3] = (ToggleButton)findViewById(R.id.toggleButton4);

然后在您的buttonPressed处理程序中:

Then in your buttonPressed handler :

String text = "Buttons pressed: ";
for (int i = 0; i < 4; i++) {
    if (btn[i].isCheck()) {
        text += (i + 1) + ", ";
    }
}
buttons.setText(text);

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