我在 xml 中有一个空的线性布局。我正在向它动态添加一些 TextView 。
一旦这些 TextView 超过 5 个，我就会在其中再创建一个线性布局，并将 TextView 添加到新创建的布局中。最后将这个新布局添加到主布局。
我可以添加，即在模拟器中它占据了那个空间，但不会在 TextView 中显示信息。
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>
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);
}
}
}
}
}
我哪里错了？
最佳答案
您的主要 LinearLayout 设置为 Horizontal，因此前 5 个 TextView 和 layout2 显示在同一行上。将 Layout3 添加到 Layout2 使得 Layout3 从主线性布局的最后一个 TextView 的右侧显示。在 10 英寸的平板电脑上，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));
代替
text.setLayoutParams(new LayoutParams(155, LaoutParams.WRAP_CONTENT));
你应该会看到所有的 TextView 。
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>
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);
}
}
}
}
关于android - 线性布局内的线性布局正在添加但不可见，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11734909/