如何通过重用一个布局动态创建 android table？

Question

我正在制作一个应用程序来将小型数据库的内容显示为动态创建的 table。我使用 init() 函数创建 table onCreate 并希望它随后填充数据。由于第一行或标题行是静态的，我决定对该行进行硬编码，然后通过数据库循环创建其余部分。问题是当我尝试运行时它确实会抛出 IndexOutOfBoundsException。我假设它与我用来回收我的布局的 removeView() 调用有关，但真的不确定。任何人都可以向我解释我做错了什么吗？

初始化函数：

//Initiates the table
public void init(){

    //This part defines the layout to be used for creating new rows
    TableLayout ll = (TableLayout) findViewById(R.id.tableLayout);
    TableRow row= new TableRow(this);
    TableRow.LayoutParams lp = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT);
    row.setLayoutParams(lp);
    TextView tdate = new TextView(this);
    TextView tweight = new TextView(this);

    //This generates the caption row
    tdate.setText("Weight");
    tdate.setPadding(3, 3, 3, 3);
    tweight.setText("Date");
    tweight.setPadding(3, 3, 3, 3);
    row.addView(tdate);
    row.addView(tweight);
    ll.addView(row,0);

    //This loop adds the database content to the table (using hardcoded values here for demonstration)
    for (int i = 1; i < 3; i++) {
        ((ViewGroup)tdate.getParent()).removeView(tdate);
        ((ViewGroup)tweight.getParent()).removeView(tweight);
        ((ViewGroup)row.getParent()).removeView(row);

        tdate.setText("20.20.2020");
        tdate.setPadding(3, 3, 3, 3);
        tweight.setText("89");
        tweight.setPadding(3, 3, 3, 3);
        row.addView(tdate);
        row.addView(tweight);
        ll.addView(row,i);
    }
}

Logcat:

07-03 11:00:34.903  30276-30276/net.sanctum.adhominem.sanctum E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: net.sanctum.adhominem.sanctum, PID: 30276
java.lang.RuntimeException: Unable to start activity ComponentInfo{net.sanctum.adhominem.sanctum/net.sanctum.adhominem.sanctum.Log}: java.lang.IndexOutOfBoundsException: index=1 count=0
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2329)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
        at android.app.ActivityThread.access0(ActivityThread.java:147)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1296)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5254)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)
 Caused by: java.lang.IndexOutOfBoundsException: index=1 count=0
        at android.view.ViewGroup.addInArray(ViewGroup.java:3971)
        at android.view.ViewGroup.addViewInner(ViewGroup.java:3902)
        at android.view.ViewGroup.addView(ViewGroup.java:3733)
        at android.widget.TableLayout.addView(TableLayout.java:429)
        at android.view.ViewGroup.addView(ViewGroup.java:3678)
        at android.widget.TableLayout.addView(TableLayout.java:411)
        at net.sanctum.adhominem.sanctum.Log.init(Log.java:77)
        at net.sanctum.adhominem.sanctum.Log.onCreate(Log.java:20)
        at android.app.Activity.performCreate(Activity.java:5933)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2282)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2389)
            at android.app.ActivityThread.access0(ActivityThread.java:147)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1296)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5254)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:898)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)

Answer 1

使用这个，

//Initiates the table
public void init(){

    //This part defines the layout to be used for creating new rows
    TableLayout ll = (TableLayout) findViewById(R.id.table_layout);
    TableRow row= new TableRow(this);
    TableRow.LayoutParams lp = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT);
    row.setLayoutParams(lp);
    TextView tdate = new TextView(this);
    TextView tweight = new TextView(this);

    //This generates the caption row
    tdate.setText("Weight");
    tdate.setPadding(3, 3, 3, 3);
    tweight.setText("Date");
    tweight.setPadding(3, 3, 3, 3);
    row.addView(tdate);
    row.addView(tweight);
    ll.addView(row,0);

    //This loop adds the database content to the table (using hardcoded values here for demonstration)
    for (int i = 1; i < 3; i++) {

        row= new TableRow(this);
        lp = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT);
        row.setLayoutParams(lp);
        tdate = new TextView(this);
        tweight = new TextView(this);
        tdate.setText("20.20.2020");
        tdate.setPadding(3, 3, 3, 3);
        tweight.setText("89");
        tweight.setPadding(3, 3, 3, 3);
        row.addView(tdate);
        row.addView(tweight);
        ll.addView(row,i);
    }
}

如何通过重用一个布局动态创建 android table？

How to create an android table dynamically by reusing one layout?

android

android-layout

indexoutofboundsexception

android-view

android-tablelayout