起動時にこの画面の中央に表示され、プロンプトを表示するボタンがどこにあるかに関係なく、その幅が画面全体を占めないポップアップを作成しようとしています。また、ユーザーがバックグラウンドでのアクティビティをぼんやりと見ることができるように透明性を追加したかったのですが、アルファ版での作業にも問題がありました。これまでの私の試みは満足のいくものではありませんでした。
特に、showAtLocation メソッドで重力を使用しようとすると、次のエラー メッセージが表示されます。
任意の支援をいただければ幸いです。前もって感謝します。
以下はアクティビティコードです
import android.app.Activity;
import android.graphics.Color;
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.PopupWindow;
import android.widget.TextView;
import android.view.View.OnClickListener;
public class MainActivity extends Activity implements OnClickListener {
LinearLayout popupLayout;
PopupWindow popupMessage;
Button popupButton, insidePopupButton;
TextView popupText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main); init(); popupInit(); }
public void init() { popupButton = (Button) findViewById(R.id.popupbutton);
popupText = new TextView(this);
insidePopupButton = new Button(this);
popupLayout = new LinearLayout(this);
popupLayout.setBackgroundColor(Color.parseColor("#dd000000"));
popupLayout.setGravity(Gravity.CENTER);
insidePopupButton.setText("OK");
popupText.setText("This is Popup Window.press OK to dismiss it.");
popupText.setPadding(30, 40, 30, 20);
popupLayout.setOrientation(1);
popupLayout.addView(popupText);
popupLayout.addView(insidePopupButton);
}
public void popupInit() {
popupButton.setOnClickListener(this);
insidePopupButton.setOnClickListener(this);
popupMessage = new PopupWindow(popupLayout, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
popupMessage.setContentView(popupLayout);
popupMessage.showAtLocation(this, Gravity.CENTER, 0, 0);
}
@Override public void onClick(View v) {
if (v.getId() == R.id.popupbutton) {
popupMessage.showAsDropDown(popupButton, 0, 0);
}
else {
popupMessage.dismiss();
} } }
以下はxmlレイアウトコードです
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="56dp"
android:text="good day, click button below to see popup" />
<Button
android:id="@+id/popupbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Show Popup" />
</RelativeLayout>
更新されたコード
/**
* Copyright 2010-present Facebook.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.facebook.samples.friendpicker;
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.PopupWindow;
import android.widget.TextView;
public class PopupDemoActivity extends Activity implements OnClickListener {
LinearLayout layoutOfPopup;
PopupWindow popupMessage;
Button popupButton, insidePopupButton;
TextView popupText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main); init(); popupInit(); }
public void init() { popupButton = (Button) findViewById(R.id.popupbutton);
popupText = new TextView(this);
insidePopupButton = new Button(this);
layoutOfPopup = new LinearLayout(this);
insidePopupButton.setText("OK");
popupText.setText("This is Popup Window.press OK to dismiss it.");
popupText.setPadding(0, 0, 0, 20);
layoutOfPopup.setOrientation(1);
layoutOfPopup.addView(popupText);
layoutOfPopup.addView(insidePopupButton);
}
public void popupInit() {
popupButton.setOnClickListener(this);
insidePopupButton.setOnClickListener(this);
View parent = findViewById(R.layout.main);
popupMessage = new PopupWindow(layoutOfPopup, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
popupMessage.setContentView(layoutOfPopup);
popupMessage.showAtLocation(parent, Gravity.CENTER, 0, 0);
}
@Override public void onClick(View v) {
if (v.getId() == R.id.popupbutton) {
popupMessage.showAsDropDown(popupButton, 0, 0);
}
else {
popupMessage.dismiss();
} } }
logcat からのメッセージ
07-29 12:36:19.761: E/AndroidRuntime(1720): FATAL EXCEPTION: main
07-29 12:36:19.761: E/AndroidRuntime(1720): Process: com.example.popuptest, PID: 1720
07-29 12:36:19.761: E/AndroidRuntime(1720): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.popuptest/com.example.popuptest.PopupDemoActivity}: java.lang.NullPointerException
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.app.ActivityThread.access$800(ActivityThread.java:135)
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.os.Handler.dispatchMessage(Handler.java:102)
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.os.Looper.loop(Looper.java:136)
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.app.ActivityThread.main(ActivityThread.java:5017)
07-29 12:36:19.761: E/AndroidRuntime(1720): at java.lang.reflect.Method.invokeNative(Native Method)
07-29 12:36:19.761: E/AndroidRuntime(1720): at java.lang.reflect.Method.invoke(Method.java:515)
07-29 12:36:19.761: E/AndroidRuntime(1720): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-29 12:36:19.761: E/AndroidRuntime(1720): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-29 12:36:19.761: E/AndroidRuntime(1720): at dalvik.system.NativeStart.main(Native Method)
07-29 12:36:19.761: E/AndroidRuntime(1720): Caused by: java.lang.NullPointerException
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.widget.PopupWindow.showAtLocation(PopupWindow.java:814)
07-29 12:36:19.761: E/AndroidRuntime(1720): at com.example.popuptest.PopupDemoActivity.popupInit(PopupDemoActivity.java:41)
07-29 12:36:19.761: E/AndroidRuntime(1720): at com.example.popuptest.PopupDemoActivity.onCreate(PopupDemoActivity.java:23)
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.app.Activity.performCreate(Activity.java:5231)
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
07-29 12:36:19.761: E/AndroidRuntime(1720): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)