Pageviewer.java代码：
//hide status bar/action bar on single tap
package com.app.imageswiper;
import android.app.ActionBar;
import android.app.Dialog;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.support.design.widget.TabLayout;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
public class Pageviwer extends AppCompatActivity {
private Integer[] mImageIds = {R.drawable.page001, R.drawable.page002,
R.drawable.page003};
private static final String DEBUG_TAG = "pageviwer ";
ImageView imageView;
float startXValue = 1;
public int num;
public int click;
protected static final String TAG = "Pageviwer";
private GestureDetector mGestureDetector;
public SharedPreferences prefs;
public static int Bookmark = 0;
public static int Pageno = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
prefs = PreferenceManager.getDefaultSharedPreferences(this);
int Bookmark1 = prefs.getInt("Bookmark", 0);
Bookmark = Bookmark1;
prefs = PreferenceManager.getDefaultSharedPreferences(this);
int Pageno1 = prefs.getInt("Pageno", 0);
Pageno = Pageno1;
setContentView(R.layout.pageviwer);
imageView = (ImageView) findViewById(R.id.image_place_holder);
imageView.setImageResource(mImageIds[0]);
TextView tv1 = (TextView) findViewById(R.id.pageno);
tv1.setText("" + (num + 1));
Toast.makeText(getApplicationContext(), "value is " + num, Toast.LENGTH_LONG).show();
setupGestureDetector();
hideActionBar(); // hide action bar after 1 second
}
private void setupGestureDetector() {
mGestureDetector = new GestureDetector(this,
new GestureDetector.SimpleOnGestureListener() {
//Detecting Swipe/Fling Direction
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
Log.i(TAG, "onFling");
if (e1.getX() < e2.getX()) {
Log.d(TAG, "Left to Right swipe performed");
if (num == 2) {
num = num;
} else {
imageView.setImageResource(mImageIds[num + 1]);
num = num + 1;
}
TextView tv1 = (TextView) findViewById(R.id.pageno);
tv1.setText("" + (num + 1));
Toast.makeText(getApplicationContext(), "value is " + num, Toast.LENGTH_LONG).show();
}
if (e1.getX() > e2.getX()) {
Log.d(TAG, "Right to Left swipe performed");
if (num == 0) {
num = num;
} else {
imageView.setImageResource(mImageIds[num - 1]);
num = num - 1;
}
TextView tv1 = (TextView) findViewById(R.id.pageno);
tv1.setText("" + (num + 1));
Toast.makeText(getApplicationContext(), "value is " + num, Toast.LENGTH_LONG).show();
}
return true;
}
//detecting single tap
@Override
public boolean onSingleTapUp(MotionEvent e) {
Log.i(TAG, "onSingleTapUp");
Toast.makeText(getApplicationContext(), "Single Tap ", Toast.LENGTH_LONG).show();
//Remove notification bar and action bar
if (click == 0) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN);
if (getSupportActionBar() != null) getSupportActionBar().hide();
click = 1;
}
//Return notification bar and action bar
else {
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().getDecorView().setSystemUiVisibility(
View.SYSTEM_UI_FLAG_LAYOUT_STABLE
| View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
if (getSupportActionBar() != null) getSupportActionBar().show();
click = 0;
}
return true;
}
});
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mGestureDetector != null) {
return mGestureDetector.onTouchEvent(event);
} else {
return super.onTouchEvent(event);
}
}
public void hideActionBar() {
Handler h = new Handler();
h.postDelayed(new Runnable() {
@Override
public void run() {
// DO DELAYED STUFF
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
if (getSupportActionBar() != null) getSupportActionBar().hide();
click = 1;
}
}, 1000); // 1000 milliseconds (1 second)
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == com.app.imageswiper.R.id.action_settings) {
Bookmark=1;
prefs.edit().putInt("Bookmark", Bookmark).commit();
prefs.edit().putInt("Pageno", num).commit();
Toast.makeText(getApplicationContext(), "Bookmark value is "+Bookmark, Toast.LENGTH_LONG).show();
}
return super.onOptionsItemSelected(item);
}
}
ViewPagerAdapter代码：
package com.app.imageswiper;
/**
* Created by Jaffer on 14-Apr-16.
*/
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.Toast;
public class Bookmarks extends Fragment {
public SharedPreferences prefs;
public static int Bookmark = 0;
public static int Pageno = 0;
Button sendButton = null;
View inflatedView = null;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
int Bookmark1 = prefs.getInt("Bookmark", 0);
Bookmark = Bookmark1;
prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
int Pageno1 = prefs.getInt("Pageno", 0);
Pageno = Pageno1;
this.inflatedView = inflater.inflate(R.layout.bookmarks, container, false);
sendButton = (Button) inflatedView.findViewById(R.id.bookmark);
if(Bookmark==1){sendButton.setText("Page "+Pageno);}
else {sendButton.setText("No Bookmark ");}
if(sendButton == null)
{
Log.d("debugCheck", "HeadFrag: sendButton is null");
return inflatedView;
}
sendButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), Pageviwer.class);
startActivity(intent);
}
});
return inflatedView;
}
}
bookmarks.xml代码：
<?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"
android:id="@+id/bookmarks">
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAllCaps="false"
style="@style/Widget.AppCompat.Button.Borderless"
android:id="@+id/bookmark"
android:layout_alignParentBottom="true" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@android:color/darker_gray"/>
</LinearLayout>
我不知道如何更新来自Pageviewer.java的按钮文本，以获取带有R.id.bookmark的按钮，该按钮显示在菜单项R.id.action_settings点击的书签片段上。我想这样做，以便按钮文本对应于被加入书签的页面。我尝试了很多东西，但无济于事。有人可以帮我什么吗？
提前致谢
答案 0 :(得分：0)
在片段中创建一个方法来更新按钮的文本。
public void updateText(String newText){
//assuming button is globally declared in your fragment.
button.setText(newText);
}
您可以使用支持向左和向右滑动的ViewPager代替手势检测器。您可以找到示例实现here。
然后在您的Activty中，在PageChanegListener上实施ViewPager。
viewPager.addOnPageChangeListener(new OnPageChangeListener() {
public void onPageScrollStateChanged(int state) {}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}
public void onPageSelected(int position) {
// Check if this is the page you want.You have to implement viewpager's adapter with getItem(index) which returns a fragment at that index.
BookMarkFragment fragment (BookMarkFragment)mAdapter.getItem(position);
fragment.updateText(newText);
};
});
答案 1 :(得分：0)
你应该在某个地方保存按钮的状态。您的字段int Bookmark == 0，因此表达式sendButton.setText("Page "+Pageno);永远不会执行。将状态保存在SharedPreferences中并获取此状态。像这样：
prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
int isBookmark = prefs.getInt("Bookmark", 0);
int mPageno = prefs.getInt("Pageno", 0);
...
if(isBookmark == 1){
sendButton.setText("Page " + mPageno);
} else {
sendButton.setText("No Bookmark");
}