Android 线性布局内的线性布局正在添加但不可见
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linear layout inside linear layout is adding but is not visible
提问by Mouni
I'm having one empty Linear Layout in xml. And I'm adding some text view to it dynamically.
我在 xml 中有一个空的线性布局。我正在向它动态添加一些文本视图。
once these textviews exceeds 5 then i'm creating one more linear layout inside it and adding text views to newly created Layout. And finally adding this new layout to main layout.
一旦这些文本视图超过 5，我就会在其中创建一个更多的线性布局，并将文本视图添加到新创建的布局中。最后将这个新布局添加到主布局中。
I'm able to add, i.e in emulator it occupy that space but, will not display the info in the textviews.
我可以添加，即在模拟器中它占据了那个空间，但是不会在 textviews 中显示信息。
my xml is as follows:
我的xml如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/dyn_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="10dip" >
</LinearLayout>
</ScrollView>
<Button
android:id="@+id/dyn_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add TextViews" />
</LinearLayout>
and my java file is as follows:
我的java文件如下：
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
public class AddTextViewsDynamically extends Activity implements
OnClickListener {
Button button;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_textview_dynamically);
button = (Button) findViewById(R.id.dyn_button1);
button.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.dyn_button1:
LinearLayout layout = (LinearLayout) findViewById(R.id.dyn_layout);
LinearLayout layout2 = null;
LinearLayout layout3 = null;
for (int i = 0; i < 10; i++) {
if (i > 4) {
if (i == 5) {
layout2 = new LinearLayout(this);
layout2.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
layout2.setOrientation(LinearLayout.VERTICAL);
layout2.setPadding(10, 60, 10, 10);
layout3 = new LinearLayout(this);
layout3.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
layout3.setOrientation(LinearLayout.HORIZONTAL);
layout3.setPadding(10, 10, 10, 10);
}
System.out.println("**** Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout3.addView(text);
if (i == 9) {
System.out
.println("Added second linear layout to first");
layout2.setVisibility(View.VISIBLE);
layout2.addView(layout3);
layout.addView(layout2);
}
} else {
System.out.println("###### Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout.addView(text);
}
}
}
}
}
Where am I going wrong?
我哪里错了？
采纳答案by cosmincalistru
Your primary LinearLayout is set to Horizontal so the first 5 text view and the layout2 are shown on the same line. Adding Layout3 to Layout2 makes the Layout3 to be shown from the right of the last text view from primary Linear Layout. On a 10 inch tablet i see only the first 2 elements of your LinearLayout. Perhaps on a smaller screen you don't see them. Try using
您的主要 LinearLayout 设置为 Horizontal，因此前 5 个文本视图和 layout2 显示在同一行上。将 Layout3 添加到 Layout2 使 Layout3 从主线性布局的最后一个文本视图的右侧显示。在 10 英寸平板电脑上，我只能看到 LinearLayout 的前 2 个元素。也许在较小的屏幕上您看不到它们。尝试使用
text.setLayoutParams(new LayoutParams(50, LayoutParams.WRAP_CONTENT));
instead of
代替
text.setLayoutParams(new LayoutParams(155, LaoutParams.WRAP_CONTENT));
and you should see all your text views.
你应该看到所有的文本视图。
EDIT :In your case this should do the trick; xml :
编辑：在您的情况下，这应该可以解决问题；xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:id="@+id/dyn_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="10dip" >
</LinearLayout>
<LinearLayout
android:id="@+id/dyn_layout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:visibility="gone"
android:padding="10dip" >
</LinearLayout>
</ScrollView>
<Button
android:id="@+id/dyn_button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Add TextViews" />
</LinearLayout>
and code :
和代码：
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.dyn_button1:
LinearLayout layout = (LinearLayout) findViewById(R.id.dyn_layout);
LinearLayout layout2 = (LinearLayout) findViewById(R.id.dyn_layout2);
LinearLayout layout3 = null;
for (int i = 0; i < 10; i++) {
if (i > 4) {
if (i == 5) {
layout2.setPadding(10, 60, 10, 10);
layout3 = new LinearLayout(this);
layout3.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
layout3.setOrientation(LinearLayout.HORIZONTAL);
layout3.setPadding(10, 10, 10, 10);
}
System.out.println("**** Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout3.addView(text);
if (i == 9) {
System.out
.println("Added second linear layout to first");
layout2.setVisibility(View.VISIBLE);
layout2.addView(layout3);
}
} else {
System.out.println("###### Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout.addView(text);
}
}
}
}
回答by osayilgan
Try this one, then you will see that your code is OK.
试试这个，然后你会看到你的代码没问题。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:weightSum="100" >
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="80" >
<LinearLayout
android:id="@+id/dyn_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="10dip" >
</LinearLayout>
</HorizontalScrollView>
<Button
android:id="@+id/dyn_button1"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="20"
android:text="Add TextViews" />
</LinearLayout>
回答by abhy
Actually you are doing things right, I just removed padding and made orientation of all Linear Layouts to vertical. Modify this on xml file too and it will work :))) Its just you are adding a padding of 10 or 60 which is going of the view taken by the parent.
实际上，您做得对，我只是删除了填充并将所有线性布局的方向设置为垂直。也在 xml 文件上修改它，它会起作用:))) 它只是你添加了一个 10 或 60 的填充，这是父视图所采用的。
Modified Java Code:
修改后的 Java 代码：
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.dyn_button1:
LinearLayout layout = (LinearLayout) findViewById(R.id.dyn_layout);
LinearLayout layout2 = null;
LinearLayout layout3 = null;
for (int i = 0; i < 10; i++) {
if (i > 4) {
if (i == 5) {
layout2 = new LinearLayout(this);
layout2.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
layout2.setOrientation(LinearLayout.VERTICAL);
// layout2.setPadding(10, 10, 10, 10);
layout3 = new LinearLayout(this);
layout3.setLayoutParams(new LayoutParams(
LayoutParams.FILL_PARENT,
LayoutParams.WRAP_CONTENT));
layout3.setOrientation(LinearLayout.VERTICAL);
// layout3.setPadding(10, 10, 10, 10);
}
System.out.println("**** Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout3.addView(text);
if (i == 9) {
System.out
.println("Added second linear layout to first");
layout2.setVisibility(View.VISIBLE);
layout2.addView(layout3);
layout.addView(layout2);
}
} else {
System.out.println("###### Adding text view " + i);
TextView text = new TextView(this);
text.setText("The Value of i is :" + i);
text.setTextSize(12);
text.setGravity(Gravity.LEFT);
text.setLayoutParams(new LayoutParams(155,
LayoutParams.WRAP_CONTENT));
layout.addView(text);
}
}
}
}
