Use view to inflate multiple times

问题

I have a some problem regarding inflating and re-using the same TextView.
Its like its trying to overwrite the same textview over and over again or something and it cant do that?

LayoutInflater inflater = LayoutInflater.from(this);
View mainlayout = inflater.inflate(R.layout.days_monday_inflate, null);
View layout_number = inflater.inflate(R.layout.inflate_number, null);

for (int i = 0; i < 10; i++) {
    row = new TableRow(this);
    number = (TextView) layout_number.findViewById(R.id.Number);
    number.setTag(i);
    number.setText(Integer.toString(i));
    row.addView(number);
}
setContentView(mainlayout);

Here is the inflate_number.xml

<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/Number"
    android:layout_width="3dp"
    android:layout_height="wrap_content"
    android:layout_gravity="center|bottom"
    android:text="1" />

This is the error im getting and its on row: 51, which is: row.addView(number);

07-18 20:54:25.124: E/AndroidRuntime(1166): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
07-18 20:54:25.124: E/AndroidRuntime(1166):     at android.view.ViewGroup.addViewInner(ViewGroup.java:1970)
07-18 20:54:25.124: E/AndroidRuntime(1166):     at android.view.ViewGroup.addView(ViewGroup.java:1865)
07-18 20:54:25.124: E/AndroidRuntime(1166):     at android.view.ViewGroup.addView(ViewGroup.java:1822)
07-18 20:54:25.124: E/AndroidRuntime(1166):     at android.view.ViewGroup.addView(ViewGroup.java:1802)
07-18 20:54:25.124: E/AndroidRuntime(1166):     at com.trainingschedule.days.Monday.onCreate(Monday.java:50)
07-18 20:54:25.124: E/AndroidRuntime(1166):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-18 20:54:25.124: E/AndroidRuntime(1166):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

回答1:

You're never actually adding any Views to your Activity. You're creating new TableRows and adding TextViews to them, but you're never adding the rows to anything. Assuming you have a TableLayout in R.layout.days_monday_inflate, you should first get a reference to that view (TableLayout layout = (TableLayout)mainLayout.findViewById(R.id.my_table_layout_id)) and then add each row to that TableLayout:

TableLayout layout = (TableLayout)mainLayout.findViewById(R.id.my_table_layout_id);

for(int i = 0; i < 10; i++) {
    row = new TableRow(this);
    View layout_number = inflater.inflate(R.layout.inflate_number, layout, false);
    TextView number = (TextView) layout_number.findViewById(R.id.Number);
    number.setTag(i);
    number.setText(Integer.toString(i));
    row.addView(number);
    layout.addView(row);
}

Although I would recommend setting up your layout fully in XML if at all possible, unless needed dynamically. Also, if you're only adding one TextView per row, you're better off just using a LinearLayout, I would suggest.

回答2:

In my case, setTag(i) didn't work, what worked was changing the id after inflating the layout but before adding it to the parent view like this:

LayoutInflater inflater = LayoutInflater.from(this);
View mainlayout = inflater.inflate(R.layout.days_monday_inflate, null);
View layout_number = inflater.inflate(R.layout.inflate_number, null);

for (int i = 0; i < 10; i++) {
    row = new TableRow(this);
    number = (TextView) layout_number.findViewById(R.id.Number);
    number.setId(i); //THIS IS THE KEY STEP
    number.setText(Integer.toString(i));
    row.addView(number);
}
setContentView(mainlayout);

回答3:

You're trying to add a single TextView to multiple rows, which is what is causing your error. You'll need to reinflate layout_number each time to get a new TextView.

I'm not sure what is contained within your layout_number file, but based off what you have here, it seems like you might be better served to create new TextViews inside your loop ala

for (int i = 0; i < 10; i++) {
    row = new TableRow(this);
    number = new TextView(this);
    number.setTag(i);
    number.setText(Integer.toString(i));
    row.addView(number);
}

回答4:

Try this:

View mainlayout = inflater.inflate(R.layout.days_monday_inflate, null);

for (int i = 0; i < 10; i++) {
    row = new TableRow(this);
    View layout_number = inflater.inflate(R.layout.inflate_number, null);
    TextView number = (TextView) layout_number.findViewById(R.id.Number);
    number.setTag(i);
    number.setText(Integer.toString(i));
    row.addView(number);
}

来源：https://stackoverflow.com/questions/11550346/use-view-to-inflate-multiple-times

标签

android

inflate