【发布时间】：2015-02-20 16:56:52
【问题描述】：
我有一个实现 onGestureListener 的活动，我在它的 onFling 方法中有一些代码。我用于此活动的 xml 布局包含一个包含相对布局和自定义布局类的线性布局（垂直）。
这个自定义布局类扩展了相对布局。在这个自定义布局类中，我有一个 readerView（从 Mupdf 库打开 pdf）。当我在相对布局部分上滑动时，它可以正常工作，但是当我在我的自定义布局 (pdfLayout) 上滑动时，它不会检测到手势。我什至为 onCreate 上的 pdfLayout 设置了一个触摸监听器。我意识到，当我在 PdfLayout 上滑动时，正在调用 PdfLayout 内部的 ReaderView 中的 onFling 方法。我不明白如何从我的活动与 PdfLayout 内的读者视图进行通信。我不知道我在哪里犯了错误。感谢您的帮助！
这是我的 PdfActivity：
import java.io.File;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
public class PdfActivity extends Activity implements OnGestureListener{
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
static Context c;
static LinearLayout pdfLl;
PdfLayout pdfLayout;
static View buttons;
static RelativeLayout rl;
static String title;
TextView tv;
TextView page;
int n = 1;
int totalpages;
GestureDetector detector;
@SuppressWarnings("deprecation")
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.pdf_act);
detector=new GestureDetector(this);
View rootView = findViewById(R.layout.pdf_act);
pdfLl = (LinearLayout) findViewById(R.id.readerCont);
rl = (RelativeLayout) findViewById(R.id.buttonsCont);
pdfLayout = (PdfLayout) findViewById(R.id.pdfLayout);
ImageButton prev = (ImageButton) findViewById(R.id.prev);
ImageButton next = (ImageButton) findViewById(R.id.next);
tv = (TextView) findViewById(R.id.title);
page = (TextView) findViewById(R.id.pageNo);
page.setTextColor(Color.BLACK);
page.setTypeface(null, Typeface.ITALIC);
c = this;
Intent intent = getIntent();
Uri uri = intent.getData();
title = intent.getStringExtra("title");
totalpages = intent.getIntExtra("totalpages", 1);
page.setText(n+" of "+totalpages+" Pages");
tv.setTextColor(Color.BLACK);
tv.setTypeface(null, Typeface.BOLD_ITALIC);
tv.setText(title);
prev.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View paramView) {
// TODO Auto-generated method stub
Log.e("Pdf Act", "prev button clicked! & n="+n);
if(n>1 && n<=totalpages){
pdfLayout.pre();
n--;
File file = new File(Environment.getExternalStorageDirectory()+"/PaperBoy/AndhraBhoomi/AB"+n+".pdf");
if(file.exists() && file!=null){
pdfLayout.setCore(file.getAbsolutePath());
}
else{
pdfLayout.setCore(Environment.getExternalStorageDirectory()+"/pdpage.pdf");
}
page.setText(n+" of "+totalpages+" Pages");
}
}
});
next.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.e("Pdf Act", "next button clicked! & n="+n);
if(n>=1 && n<totalpages){
pdfLayout.next();
n++;
File file = new File(Environment.getExternalStorageDirectory()+"/PaperBoy/AndhraBhoomi/AB"+n+".pdf");
if(file.exists() && file!=null){
pdfLayout.setCore(file.getAbsolutePath());
}
else{ pdfLayout.setCore(Environment.getExternalStorageDirectory()+"/pdpage.pdf");
}
page.setText(n+" of "+totalpages+" Pages");
}
}
});
pdfLayout.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View paramView, MotionEvent paramMotionEvent) {
// TODO Auto-generated method stub
return detector.onTouchEvent(paramMotionEvent);
}
});
}
@Override
protected void onPause() {
super.onPause();
onStop();
}
public void screenTapped(View view) {
Log.e("pdf act", "tapped");
if(rl.getVisibility()==View.VISIBLE){
rl.setVisibility(View.GONE);
}
if(rl.getVisibility()==View.GONE){
rl.setVisibility(View.VISIBLE);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
return detector.onTouchEvent(event);
}
@Override
public boolean onDown(MotionEvent paramMotionEvent) {
// TODO Auto-generated method stub
Log.e("Pdf Act", "on down gesture");
return false;
}
@Override
public void onShowPress(MotionEvent paramMotionEvent) {
// TODO Auto-generated method stub
Log.e("Pdf Act", "on show press gesture");
}
@Override
public boolean onSingleTapUp(MotionEvent paramMotionEvent) {
// TODO Auto-generated method stub
Log.e("Pdf Act", "on single tap up gesture");
return true;
}
@Override
public boolean onScroll(MotionEvent paramMotionEvent1,
MotionEvent paramMotionEvent2, float paramFloat1, float paramFloat2) {
// TODO Auto-generated method stub
Log.e("Pdf Act", "on scroll gesture");
return false;
}
@Override
public void onLongPress(MotionEvent paramMotionEvent) {
// TODO Auto-generated method stub
Log.e("Pdf Act", "on long press gesture");
}
@Override
public boolean onFling(MotionEvent e1,
MotionEvent e2, float velocityX, float velocityY) {
// TODO Auto-generated method stub
Log.e("Pdf Act", "on fling gesture");
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH){
return false;
}
// right to left swipe
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
// onLeftSwipe();
if(n>=1 && n<totalpages){
pdfLayout.next();
n++;
File file = new File(Environment.getExternalStorageDirectory()+"/PaperBoy/AndhraBhoomi/AB"+n+".pdf");
if(file.exists() && file!=null){
pdfLayout.setCore(file.getAbsolutePath());
}
else{
pdfLayout.setCore(Environment.getExternalStorageDirectory()+"/pdpage.pdf");
}
page.setText(n+" of "+totalpages+" Pages");
}
}
// left to right swipe
else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
// onRightSwipe();
if(n>1 && n<=totalpages){
pdfLayout.pre();
n--;
File file = new File(Environment.getExternalStorageDirectory()+"/PaperBoy/AndhraBhoomi/AB"+n+".pdf");
if(file.exists() && file!=null){
pdfLayout.setCore(file.getAbsolutePath());
}
else{
pdfLayout.setCore(Environment.getExternalStorageDirectory()+"/pdpage.pdf");
}
page.setText(n+" of "+totalpages+" Pages");
}
}
} catch (Exception e) {
}
return false;
}
}
这是我用于上述活动的 xml 布局文件：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/readerCont"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@drawable/tiled_background">
<RelativeLayout
android:id="@+id/buttonsCont"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="@color/grey"
android:layout_gravity="top">
<ImageButton
android:id="@+id/prev"
android:src="@drawable/left_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#0000"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:paddingLeft="3dp"
android:clickable="true"/>
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:paddingTop="3dp"/>
<TextView
android:id="@+id/pageNo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_below="@+id/title"
android:paddingBottom="3dp"/>
<ImageButton
android:id="@+id/next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#0000"
android:src="@drawable/right_arrow"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:clickable="true"
android:paddingRight="3dp"/>
</RelativeLayout>
<com.paper.PdfLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/pdfLayout"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"/>
</LinearLayout>
【问题讨论】：
标签： android android-relativelayout mupdf gesturedetector onfling