添加 TextView，当按钮被按下时 Kotlin

Question

我不明白为什么不是这么简单...

       // Add field
    val LineLayoutInfo = findViewById<View>(R.id.LineLayoutInfo) as LinearLayout
    val Add_Field = findViewById<View>(R.id.buttonAddField) as Button
    Add_Field.setOnClickListener{

        val tv1 = TextView(this@MainActivity)
        tv1.text = "Show Up"
        val t = TextView(applicationContext)

        LineLayoutInfo.addView(tv1)
    }

我只想在当前的 LinearLayout 中创建一个新的 TextView。这部分代码是用 Kotlin 编写的，并存储在 OnCreate() 中。可能是因为我需要刷新 activity?

按下按钮时得到的输出如下所示。

D/HwAppInnerBoostImpl: asyncReportData com.xxx.httpposter,2,1,1,0 interval=83
I/ViewRootImpl: jank_removeInvalidNode all the node in jank list is out of time
V/AudioManager: playSoundEffect   effectType: 0
V/AudioManager: querySoundEffectsEnabled...
D/HwAppInnerBoostImpl: asyncReportData com.xxx.httpposter,2,1,2,0 interval=353

Answer 1

你可以试试这样的

private LinearLayout mLayout;
private Button mButton;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mLayout = (LinearLayout) findViewById(R.id.linearLayout);
    mButton = (Button) findViewById(R.id.button);
    mButton.setOnClickListener(onClick());
    TextView textView = new TextView(this);
    textView.setText("New text");
}

private OnClickListener onClick() {
    return new OnClickListener() {

        @Override
        public void onClick(View v) {
            mLayout.addView(createNewTextView("New Text"));
        }
    };
}

private TextView createNewTextView(String text) {
    final LayoutParams lparams = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    final TextView textView = new TextView(this);
    textView.setLayoutParams(lparams);
    textView.setText("New text: " + text);
    return textView;
}

Answer 2

在这里，您可以只创建 TextView 并在程序 onCreate() 之后的 MainActivity 上将其可见性设置为 INVISIBLE，然后在单击按钮时将其设置为 VISIBLE.你可以无限地这样做！

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