我想将一些LinearLayouts添加到现有的Linearlayout。
活动的xml看起来如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/popupLinearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPopUp"
android:gravity="center"
android:orientation="vertical" >
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none" >
<LinearLayout
android:id="@+id/ll_horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>
活动代码：
public class MainActivity extends Activity {
private Point p;
private PopupWindow popup;
private LinearLayout myLInearLayout;
private TextView valueTV;
private Button valueB;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button popUpButton = (Button) findViewById(R.id.open);
popUpButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (p != null)
showPopup(MainActivity.this, p);
}
});
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
int[] location = new int[2];
Button button = (Button) findViewById(R.id.open);
button.getLocationOnScreen(location);
// Initialize the Point with x, and y positions
p = new Point();
p.x = location[0];
p.y = location[1];
}
// The method that displays the popup.
private void showPopup(final Activity context, Point p) {
Rect rectgle = new Rect();
Window window = getWindow();
window.getDecorView().getWindowVisibleDisplayFrame(rectgle);
int popupWidth = this.getResources().getDisplayMetrics().widthPixels;
int popupHeight = this.getResources().getDisplayMetrics().heightPixels / 4;
// Inflate the popup_layout.xml
LinearLayout viewGroup = (LinearLayout) context
.findViewById(R.id.popupLinearLayout);
LayoutInflater layoutInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout = layoutInflater.inflate(R.layout.popup_layout, viewGroup);
// Creating the PopupWindow
popup = new PopupWindow(context);
popup.setContentView(layout);
popup.setWidth(popupWidth);
popup.setHeight(popupHeight);
popup.setOutsideTouchable(true);
popup.setFocusable(true);
popup.setAnimationStyle(R.style.PopupWindowAnimation);
// Some offset to align the popup a bit to the right, and a bit down,
// relative to button's position.
int OFFSET_X = 0;
int OFFSET_Y = 0;
// Clear the default translucent background
popup.setBackgroundDrawable(new BitmapDrawable());
// Displaying the popup at the specified location, + offsets.
popup.showAtLocation(layout, Gravity.NO_GRAVITY, p.x + OFFSET_X, p.y
+ OFFSET_Y);
// add LInearLayout
myLInearLayout = (LinearLayout) findViewById(R.id.ll_horizontal);
// add LayoutParams
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.MATCH_PARENT);
myLInearLayout.setOrientation(LinearLayout.HORIZONTAL);
// add textView
valueTV = new TextView(this);
valueTV.setText("The developer world is yours");
valueTV.setId(5);
valueTV.setLayoutParams(params);
// add Button
valueB = new Button(this);
valueB.setText("thedeveloperworldisyours");
valueB.setId(5);
// add the textView and the Button to LinearLayout
myLInearLayout.addView(valueTV);
myLInearLayout.addView(valueB);
}
@Override
public void onBackPressed() {
if (popup != null && popup.isShowing()) {
popup.dismiss();
popup = null;
} else {
super.onBackPressed();
}
}
正如您所看到的，我希望在向视图充气并在PopupWindow中使用动画显示它之后添加Button和TextView。我想在ScrollView中为LinearLayout添加一些视图。这是出于测试目的，稍后我想将完整的LinearLayouts添加到ScrollView内的LinearLayout。 动画完美无缺。我只是无法以编程方式添加一些视图。我得到的所有东西都是Line中的NullPointerException，我尝试添加视图。
感谢您的帮助。
答案 0 :(得分：0)
Try this way,hope this will help you to solve your problem.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button popUpButton = (Button) findViewById(R.id.open);
int[] location = new int[2];
popUpButton.getLocationOnScreen(location);
// Initialize the Point with x, and y positions
p = new Point();
p.x = location[0];
p.y = location[1];
popUpButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if (p != null)
showPopup(p);
}
});
}
// The method that displays the popup_layout.
private void showPopup(Point p) {
Rect rectgle = new Rect();
Window window = getWindow();
window.getDecorView().getWindowVisibleDisplayFrame(rectgle);
int popupWidth = this.getResources().getDisplayMetrics().widthPixels;
int popupHeight = this.getResources().getDisplayMetrics().heightPixels / 4;
// Inflate the popup_layout.xml
LinearLayout viewGroup = (LinearLayout) findViewById(R.id.popupLinearLayout);
View layout = LayoutInflater.from(this).inflate(R.layout.popup_layout, viewGroup);
// Creating the PopupWindow
popup = new PopupWindow(this);
popup.setContentView(layout);
popup.setWidth(popupWidth);
popup.setHeight(popupHeight);
popup.setOutsideTouchable(true);
popup.setFocusable(true);
// popup.setAnimationStyle(R.style.PopupWindowAnimation);
// Some offset to align the popup_layout a bit to the right, and a bit down,
// relative to button's position.
int OFFSET_X = 0;
int OFFSET_Y = 0;
// Clear the default translucent background
popup.setBackgroundDrawable(new BitmapDrawable());
// Displaying the popup_layout at the specified location, + offsets.
popup.showAtLocation(layout, Gravity.NO_GRAVITY, p.x + OFFSET_X, p.y + OFFSET_Y);
// add LInearLayout
myLInearLayout = (LinearLayout) layout.findViewById(R.id.ll_horizontal);
// add LayoutParams
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.MATCH_PARENT);
myLInearLayout.setOrientation(LinearLayout.HORIZONTAL);
// add textView
valueTV = new TextView(this);
valueTV.setText("The developer world is yours");
valueTV.setId(5);
valueTV.setLayoutParams(params);
// add Button
valueB = new Button(this);
valueB.setText("thedeveloperworldisyours");
valueB.setId(5);
// add the textView and the Button to LinearLayout
myLInearLayout.addView(valueTV);
myLInearLayout.addView(valueB);
}
答案 1 :(得分：0)
我想出了怎么做。我只需要膨胀popup.xml就可以获得我想要自定义的LinearLayout的引用。
以下是有人遇到同样问题的代码：
public class MainActivity extends Activity {
private Point p;
private PopupWindow popup;
private Button popUpButton;
private TextView valueTV;
private Button valueB;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
popUpButton = (Button) findViewById(R.id.open);
popUpButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (p != null)
showPopup(MainActivity.this, p);
}
});
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
int[] location = new int[2];
Button button = (Button) findViewById(R.id.open);
button.getLocationOnScreen(location);
// Initialize the Point with x, and y positions
p = new Point();
p.x = location[0];
p.y = location[1];
}
// The method that displays the popup.
private void showPopup(final Activity context, Point p) {
Rect rectgle = new Rect();
Window window = getWindow();
window.getDecorView().getWindowVisibleDisplayFrame(rectgle);
int popupWidth = this.getResources().getDisplayMetrics().widthPixels;
int popupHeight = this.getResources().getDisplayMetrics().heightPixels / 4;
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View contentView = inflater.inflate(R.layout.popup_layout, null);
ViewGroup dlgView = (ViewGroup) contentView
.findViewById(R.id.ll_horizontal);
// Creating the PopupWindow
popup = new PopupWindow(context);
popup.setContentView(contentView);
popup.setWidth(popupWidth);
popup.setHeight(popupHeight);
popup.setFocusable(true);
popup.setAnimationStyle(R.style.PopupWindowAnimation);
// Some offset to align the popup a bit to the right, and a bit down,
// relative to button's position.
int OFFSET_X = 0;
int OFFSET_Y = 0;
// Clear the default translucent background
popup.setBackgroundDrawable(new BitmapDrawable());
// add textView
valueTV = new TextView(this);
valueTV.setText("The developer world is yours");
valueTV.setId(5);
// add Button
valueB = new Button(this);
valueB.setText("thedeveloperworldisyours");
valueB.setId(5);
// add the textView and the Button to LinearLayout
dlgView.addView(valueTV);
dlgView.addView(valueB);
// Displaying the popup at the specified location, + offsets.
popup.showAtLocation(popUpButton, Gravity.NO_GRAVITY, p.x + OFFSET_X,
p.y + OFFSET_Y);
}
}