私はこれがどこにもこの答えを見つけることができないと信じるのが難しいと思います。私が持っているコードは、ボタンビューの存在をチェックするために正しく機能していないようです。これが私が持っているものです、どんな提案も大歓迎です。ありがとう！
Javaファイル：
public class LayoutsActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ActivateButtons();
}
void ActivateButtons()
{
Button mainLayoutButton = (Button) this.findViewById(R.id.MainLayout);
if(mainLayoutButton != null)
{
mainLayoutButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setContentView(R.layout.main);
ActivateButtons();
}
});
}
Button linearLayoutButton = (Button) this.findViewById(R.id.LinearLayout);
if(linearLayoutButton != null)
{
linearLayoutButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setContentView(R.layout.mylinearlayout);
ActivateButtons();
}
});
}
Button tableLayoutButton = (Button) this.findViewById(R.id.TableLayout);
tableLayoutButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setContentView(R.layout.mytablelayout);
ActivateButtons();
}
});
Button frameLayoutButton = (Button) this.findViewById(R.id.FrameLayout);
if(frameLayoutButton != null)
{
frameLayoutButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setContentView(R.layout.myframelayout);
ActivateButtons();
}
});
}
Button relativeLayoutButton = (Button) this.findViewById(R.id.RelativeLayout);
if(relativeLayoutButton != null)
{
relativeLayoutButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setContentView(R.layout.myrelativelayout);
ActivateButtons();
}
});
}
Button absoluteLayoutButton = (Button) this.findViewById(R.id.AbsoluteLayout);
if(absoluteLayoutButton != null)
{
absoluteLayoutButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
setContentView(R.layout.myabsolutelayout);
ActivateButtons();
}
});
}
Button DynamicLayoutButton = (Button) this.findViewById(R.id.DynamicLayout);
if(DynamicLayoutButton != null)
{
DynamicLayoutButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
LinearLayout dynamicLayout = new LinearLayout(LayoutsActivity.this);
dynamicLayout.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams size=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
final TextView mytext= new TextView(LayoutsActivity.this);
mytext.setText("This is the dynamic layout");
mytext.setTextSize(20);
mytext.setGravity(Gravity.CENTER);
dynamicLayout.addView(mytext, size);
/* Button b= new Button(LayoutsActivity.this);
b.setText("Click Here to go to Main Layout");
dynamicLayout.addView(b, size); */
Button b= new Button(LayoutsActivity.this);
b.setText("Main Layout");
b.setId(R.id.DynamicLayout);
dynamicLayout.addView(b, size);
//Step L
Button linear = new Button(LayoutsActivity.this);
b.setText("Linear Layout");
b.setId(R.id.LinearLayout);
dynamicLayout.addView(linear, size);
Button table = new Button(LayoutsActivity.this);
table.setText("Table Layout");
table.setId(R.id.LinearLayout);
dynamicLayout.addView(table, size);
ActivateButtons();
setContentView(dynamicLayout);
}
});
}
}
}
XMLファイル：レイアウトごとに1つありますが、すべて類似しています
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Button
android:id="@+id/LinearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Linear layout" />
<!-- The layout lays out its children next to each other (horizontally or vertically)-->
<Button
android:id="@+id/TableLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Table Layout" />
<!-- The layout represents a table like structure where there are columns and rows for the children-->
<Button
android:id="@+id/FrameLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Frame Layout" />
<!-- The layout places the children on top of one another-->
<Button
android:id="@+id/RelativeLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Relative Layout" />
<!-- The layout positions its children relative to each other-->
<Button
android:id="@+id/AbsoluteLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Absolute Layout" />
<!-- The layout has children with absolute coordinates-->
<Button
android:id="@+id/DynamicLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Dynamic Layout" />
<!-- The layout creates a second, new page -->
<Button
android:id="@+id/MainLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Main Layout" />
<!-- The layout returns to the original layout which seems to be similar to the linear layout-->
</LinearLayout>