如何在Android中以编程方式将TextView设置为LinearLayout？

Question

I am creating a TextView dynamically. Here, I am creating a mainLayout in which I have two child layout and I wan gave them weight.

Here, is my Layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:baselineAligned="false"
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">

        <LinearLayout
            android:id="@+id/Layout_second_overs"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="6"
            android:orientation="vertical">

            <!--Second textview overs-->
        </LinearLayout>
        <LinearLayout
            android:id="@+id/Layout_second_balls"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:orientation="horizontal">

            <!--Second textview balls--> //here i inflate 12 textview dynamically but not 12 seen on the device while i run the app.
        </LinearLayout>
    </LinearLayout>
</LinearLayout>

Code to create a 12 TextViews and put into layout.

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

for(int a = 0; a <= 12; a++)
{
    TextView first = new TextView(getApplicationContext());
    first.setLayoutParams(params);
    first.setTextColor(Color.parseColor("#000000"));
    first.setTextSize(12);
    first.setGravity(Gravity.LEFT);
    first.setPadding(5, 0, 5, 0);
    first.setText("12");
    layout_second_balls.addView(first); //This is my linear layout which id is Layout_second_balls
}

Problem is my all data are print into log but not visible on the device.

Please, help me to solve out this problem.

Answer 1

You have to assign index for a view while performing addview(view,index) set index for each textview created in for loop like layout_second_balls.addView(first,index);

Code should look like :

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
for(int a = 0; a <= 12; a++)
{
    TextView first = new TextView(getApplicationContext());
    first.setLayoutParams(params);
    first.setTextColor(Color.parseColor("#000000"));
    first.setTextSize(12);
    first.setGravity(Gravity.LEFT);
    first.setPadding(5, 0, 5, 0);
    first.setText("12");
    layout_second_balls.addView(first,a);
}

Hope it will work.

Answer 2

You can use this line of code.

LinearLayout  layout_second_balls=(LinearLayout) findViewById(R.id.Layout_second_balls);

    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
    for(int a = 0;a<=12;a++)
    {
        TextView first = new TextView(getApplicationContext());
        first.setLayoutParams(params);
        first.setTextColor(Color.parseColor("#000000"));
        first.setTextSize(12);
        first.setGravity(Gravity.LEFT);
        first.setPadding(5, 0, 5, 0);
        first.setText("12");
        layout_second_balls.addView(first);
    }

i run this code in my emulator and i got this out put.

Answer 3

Your layout_second_overs requires all of your screen space - so your layout_second_balls is moved out of your screen. If you want to see your two LinearLayouts beside each other, you need to set the layout_width to "0dp":

//pseudo, simply change width to 0dp

<LinearLayout
    android:layout_height="40dp"
    .... >
    <LinearLayout
        android:layout_width="0dp"
        android:layout_weight="6"/>
    <LinearLayout
        android:layout_width="0dp"
        android:layout_weight="1"/>

</LinearLayout>

Answer 4

To replace this kind of loops you are supposed to use a RecyclerView . It is easy to use and responsive (since your list will be scrollable). The things you have to remember while implementing a RecyclerView are to add an adapter and a LayoutManager to it.

For your example :

LayoutManager manager = new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, true);
YourAdapter adapter = new YourAdapter([...]);
RecyclerView recyclerView = findViewById(R.id.your_recyclerview_here);

recyclerView.setLayoutManager(manager);
recyclerView.setAdapter(adapter);

If you need any advices for creating your adapter just ask.

Answer 5

There are two issues

• One is for the Layout Design related
• Second based on the layout design and property you also need to handle is while you are adding dynamically view into linear layout

Here what i have changed in Your xml file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:baselineAligned="false"
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">

        <LinearLayout
            android:id="@+id/Layout_second_overs"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <!--Second textview overs-->
        </LinearLayout>
        <LinearLayout
            android:id="@+id/Layout_second_balls"
            android:layout_width="0dp"
            android:layout_height="fill_parent"
            android:layout_weight="1" android:background="#FF13C7FF"
            android:orientation="horizontal">

        </LinearLayout>
    </LinearLayout>
</LinearLayout>

In Layout_second_overs linearlayout height , Width & weight is the issue.
& in Layout_second_balls linear layout you have used weight as 1 so you also required layout_height as 0dp if orientation is horizontal

Now below things i have changed in code

LinearLayout.LayoutParams params = new
                LinearLayout.LayoutParams
                (0, LinearLayout.LayoutParams.WRAP_CONTENT);
        for(int a = 0;a<=12;a++)
        {
            TextView first = new TextView(getActivity());
            first.setLayoutParams(params);
            first.setTextColor(Color.parseColor("#000000"));
            first.setTextSize(12);
            params.weight = 1; /// Need to give weight if you want equal size of textview inside Linear
            first.setGravity(Gravity.LEFT);
            first.setPadding(5, 0, 5, 0);
            first.setText("12");
            Layout_second_balls.addView(first); //This is my linear layout which id is Layout_second_balls
        }

above things are based on the question which you ask

Suggestion

Avoid adding dynamic view like you asked . prefer to use ListView, GridView, RecyclerView for this type of functionality.