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これは、他のアクティビティによって拡張されるBaseActivityクラスです。getSupportActionBar（）でnullポインタを取得する
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.SearchView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;
import com.bidhee.jme.R;
import com.bidhee.jme.controller.bus_and_events.EventBus;
import com.bidhee.jme.controller.bus_and_events.Events;
import com.bidhee.jme.model.SearchViewModel;
import com.bidhee.jme.utils.Metadata;
import com.bidhee.jme.utils.UtilityMethods;
import butterknife.Bind;
import butterknife.ButterKnife;
/**
* Created by ronem on 6/5/16.
*/
public abstract class BaseActivity extends AppCompatActivity {
private String TAG = getClass().getSimpleName();
@Bind(R.id.toolbar)
Toolbar toolbar;
public SearchView searchView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(getResourceLayout());
/**
* Bind {@link ButterKnife}
*/
ButterKnife.bind(this);
EventBus.register(this);
/**
* Setting toolbar in the place of actionbar
* and enabling the back arrow on it so that use can go back to the previous activity
*/
setSupportActionBar(toolbar);
assert getSupportActionBar() != null;
if (getSupportActionBar() != null) {
this.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
this.getSupportActionBar().setHomeButtonEnabled(true);
}
/**
* Loop through all the child's of toolbar
* and change the attributes value
*/
if (getActivityId() != 0) {
if (toolbar != null) {
for (int i = 0; i < toolbar.getChildCount(); i++) {
View view = toolbar.getChildAt(i);
if (view instanceof ImageButton) {
ImageButton tv = (ImageButton) view;
tv.setColorFilter(Color.WHITE);
}
}
}
}
/**
* If getActivityId matches with the {@link Metadata.DASHBOARD_ID}
* set actionbar title to empty
* change the navigation icon to custom icon
* and background of the action bar to transparent
*
*/
if (getActivityId() == Metadata.DASHBOARD_ID) {
if (getSupportActionBar() != null) {
this.getSupportActionBar().setHomeAsUpIndicator(R.mipmap.ic_person_outline_black_24dp);
this.getSupportActionBar().setBackgroundDrawable(new ColorDrawable(getResources().getColor(R.color.transparent)));
}
}
if (getSupportActionBar() != null)
getSupportActionBar().setTitle(getActivityTitle());
/**
* change the status bar color
*/
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().setStatusBarColor(getResources().getColor(R.color.colorPrimaryDark));
}
}
//returns layout resource
public abstract int getResourceLayout();
//returns Activity's ID
public abstract int getActivityId();
//returns Activity Title
public abstract String getActivityTitle();
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_japan_money_express, menu);
//setting all menu items tint color to white
UtilityMethods.setTintColorForMenuItems(menu);
//referencing to search menu item
MenuItem menuItem = menu.findItem(R.id.action_search);
searchView = (SearchView) menuItem.getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
EventBus.post(new Events.SearchViewEvent(new SearchViewModel(newText)));
return false;
}
});
if (getActivityId() == Metadata.DASHBOARD_ID) {
//show only chat notification icon on toolbar menu and hide rest of the items of toolbar
showMenu(menu, 0);
} else if (getActivityId() == Metadata.MONEY_TRANSFER_INITIAL_ID) {
//show only search view icon on toolbar menu and hide rest of the items of toolbar
showMenu(menu, 1);
} else {
hideAllMenu(menu);
}
return super.onCreateOptionsMenu(menu);
}
private void hideAllMenu(Menu menu) {
for (int i = 0; i < menu.size(); i++) {
menu.getItem(i).setVisible(false);
menu.getItem(i).setVisible(false);
}
}
private void showMenu(Menu menu, int position) {
for (int i = 0; i < menu.size(); i++) {
if (position == i) {
menu.getItem(i).setVisible(true);
} else {
menu.getItem(i).setVisible(false);
}
}
}
/**
* Overriding the onOptionItemSelected so that we can access the actions of the actionbar
*
* @param item
* @return
*/
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
if (getActivityId() == Metadata.DASHBOARD_ID) {
Toast.makeText(getApplicationContext(), "user info under constrction", Toast.LENGTH_SHORT).show();
} else {
this.finish();
}
break;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed() {
super.onBackPressed();
overridePendingTransition(R.anim.zoom_in_from_top_left_to_bottom_right, R.anim.slide_down_dialog);
}
@Override
protected void onDestroy() {
super.onDestroy();
/**
* must unbind the ButterKnife on Destroy
*/
ButterKnife.unbind(this);
EventBus.unregister(this);
}
}
となりますが、この基本クラスの活動を拡張し、3つの以上の活動があります。そのうちの1つはこれです。
CheckRateActivity.java
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.bidhee.jme.R;
import com.bidhee.jme.controller.bus_and_events.Events;
import com.bidhee.jme.model.CountryModel;
import com.squareup.otto.Subscribe;
import butterknife.Bind;
import butterknife.OnClick;
/**
* Created by ronem on 6/13/16.
*/
public class CheckRateActivity extends BaseActivity {
private String TAG = getClass().getSimpleName();
@Bind(R.id.sendingFromLayout)
LinearLayout sendingFromLayout;
@Bind(R.id.sendingtoLayout)
LinearLayout sendingToLayout;
CountryModel country;
ImageView fromCountryFlag, toCountryFlag;
TextView fromCountryTitle, toCountryTitle;
View arrowDownTo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
fromCountryFlag = (ImageView) sendingFromLayout.findViewById(R.id.row_image);
fromCountryTitle = (TextView) sendingFromLayout.findViewById(R.id.row_title);
fromCountryFlag.setImageResource(R.drawable.jamaica);
fromCountryTitle.setText("Jamaica");
toCountryFlag = (ImageView) sendingToLayout.findViewById(R.id.row_image);
toCountryTitle = (TextView) sendingToLayout.findViewById(R.id.row_title);
arrowDownTo = (View) sendingToLayout.findViewById(R.id.arrow_down_view);
arrowDownTo.setVisibility(View.VISIBLE);
}
@Override
public int getResourceLayout() {
return R.layout.check_rate_layout;
}
@Override
public int getActivityId() {
return 0;
}
@Override
public String getActivityTitle() {
return "Check rates";
}
@OnClick(R.id.sendingtoLayout)
public void onSendinToLayoutClicked() {
Intent intent = new Intent(CheckRateActivity.this, SelectCountryListActivity.class);
startActivity(intent);
}
@Subscribe
public void getCountry(Events.CountryModelEvent _country) {
if (_country != null) {
Log.d(TAG, _country.getCountryModel().toString());
country = _country.getCountryModel();
toCountryFlag.setImageResource(country.getCountryIcon());
toCountryTitle.setText(country.getCountryName());
Intent intent = new Intent(CheckRateActivity.this, MakeTransferActivity.class);
// Bundle bundle = new Bundle();
// bundle.putString(Metadata.COUNTRY_ID, c.getId());
// bundle.putString(Metadata.COUNTRY_NAME, c.getCountryName());
// bundle.putInt(Metadata.COUNTRY_FLAG, c.getCountryIcon());
//
// intent.putExtras(bundle);
Bundle box = new Bundle();
box.putParcelable("country", country);
intent.putExtras(box);
startActivity(intent);
}
}
}
これは、これらは
のほとんどのための円滑な実行<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="android:windowBackground">@color/white</item>
<!--<item name="colorControlHighlight">@color/white</item>-->
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
のAppスタイルです
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.bidhee.jme">
<supports-screens
android:anyDensity="true"
android:largeScreens="true"
android:normalScreens="true"
android:smallScreens="true"
android:xlargeScreens="true" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:name=".controller.AppController"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:largeHeap="true"
android:launchMode="singleTask"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".views.activities.JapanMoneyExpress"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".views.activities.Dashboard"
android:label="@string/dashboard"
android:screenOrientation="portrait" />
<activity
android:name=".views.activities.RegisterNewAccount"
android:screenOrientation="portrait" />
<activity
android:name=".views.activities.CheckRateActivity"
android:screenOrientation="portrait" />
<activity
android:name=".views.activities.SelectCountryListActivity"
android:screenOrientation="portrait" />
<activity
android:name=".views.activities.MakeTransferActivity"
android:screenOrientation="portrait" />
</application>
</manifest>
私のAndroidManifest.xmlファイルの内容です時間しかし、getSupportActionBar（）でNullpointerExceptionが発生することがあります。 StackOverflowで提案されているようにこれらのコードを使用しました。
assert getSupportActionBar() != null;
if (getSupportActionBar() != null) {
this.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
this.getSupportActionBar().setHomeButtonEnabled(true);
}
アプリが実行されますが、しばらく時間がかかりますが、ツールバーのタイトルと戻る矢印のホームキーは表示されません。 私はこれで1日以上立ち往生しています。