这里有奇怪的错误。我是android开发的新手。我有一个网格视图活动，在平板电脑上工作正常。但是，当我在智能手机上启动相同的活动时，它会崩溃。 我不知道为什么，但我对日志没有信心。我需要帮助。
我的活动课程：
public class BookletsGridActivity extends Activity {
GridView gv;
String[] images = new String[] {
"url", "url"
};
String[] names = new String[] {
"name", "name"
};
String thepdfurl;
private ImageButton button1;
private ImageButton button2;
private ImageButton button3;
private ImageButton button4;
private ImageButton button5;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Portrait only
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
//Remove title bar
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
//Remove notification bar
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_booklets);
// View's main buttons
button1 = (ImageButton)findViewById(R.id.imageButton1);
button1.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
finish();//go back to the previous Activity
overridePendingTransition(R.anim.backin, R.anim.backout);
}
});
button2 = (ImageButton)findViewById(R.id.imageButton2);
button2.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("message/rfc822");
i.putExtra(Intent.EXTRA_EMAIL , new String[]{"contact@votre-bijoutier.fr"});
i.putExtra(Intent.EXTRA_SUBJECT, "");
i.putExtra(Intent.EXTRA_TEXT , "");
try {
startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(BookletsGridActivity.this, "Pas de client de messagerie installé sur cet appareil.", Toast.LENGTH_SHORT).show();
}
}
});
button3 = (ImageButton)findViewById(R.id.imageButton3);
button3.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
Intent intent = new Intent(BookletsGridActivity.this, PhilosophyActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
}
});
button4 = (ImageButton)findViewById(R.id.imageButton6);
button4.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
Intent intent = new Intent(BookletsGridActivity.this, MapActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
}
});
button5 = (ImageButton)findViewById(R.id.imageButton4);
button5.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View Button1) {
Intent intent = new Intent(BookletsGridActivity.this, ShopsActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
}
});
gv = (GridView) findViewById(R.id.gridView);
gv.setAdapter(new Custom_view(this));
gv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
Intent intent = new Intent(BookletsGridActivity.this, PdfReader.class);
if (position == 0){
String pdfName = (names[0]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 1){
String pdfName = (names[1]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 2){
String pdfName = (names[2]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 3){
String pdfName = (names[3]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 4){
String pdfName = (names[4]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 5){
String pdfName = (names[5]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 6){
String pdfName = (names[6]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 7){
String pdfName = (names[7]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 8){
String pdfName = (names[8]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 9){
String pdfName = (names[9]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 10){
String pdfName = (names[10]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 11){
String pdfName = (names[11]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 12){
String pdfName = (names[12]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 13){
String pdfName = (names[13]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
else if (position == 14){
String pdfName = (names[14]);
System.out.println("names --->" + names);
intent.putExtra("pdfname", pdfName);
String prompt = (String)parent.getItemAtPosition(position);
intent.putExtra("pdfurl", prompt);
System.out.println("prompt --->" + prompt);
overridePendingTransition(R.anim.animationin, R.anim.animationout);
startActivity(intent);
}
}
});
}
public class Custom_view extends BaseAdapter {
Context ctx;
Custom_view(Context ctx) {
this.ctx = ctx;
}
public int getCount() {
return images.length;
}
public Object getItem(int position) {
return images[position];
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
View myview = convertView;
LayoutInflater li = getLayoutInflater();
myview = li.inflate(R.layout.gridview_item_cell, null);
// TextView tv = (TextView) myview.findViewById(R.id.textView1);
ImageView iv = (ImageView) myview.findViewById(R.id.imageView1);
if (images[position].equals(images[0])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/ca9e/3131/6100/1124/0000/thumb/OK_BRIAL_2013_CATALOGUE_50Pages-HD.png?1386672850", R.drawable.placeholder);
} else if (images[position].equals(images[1])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/cb5b/3131/6100/0e36/0000/thumb/OK_HERBERT-SURGERES_2013_CATALOGUE_50Pages-HD.png?1386672859", R.drawable.placeholder);
} else if (images[position].equals(images[2])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/c155/3131/6100/0e17/0000/thumb/OK_HEBERT-SAINTES_2013_CATALOGUE_50Pages-HD.png?1386672865", R.drawable.placeholder);
} else if (images[position].equals(images[3])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/d192/3131/6100/0e40/0000/thumb/OK_DOLET_2013_CATALOGUE_50Pages-HD.png?1386672870", R.drawable.placeholder);
} else if (images[position].equals(images[4])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/be14/3131/6100/1103/0000/thumb/OK_LASSORT_2013_CATALOGUE_50Pages-HD.png?1386672875", R.drawable.placeholder);
} else if (images[position].equals(images[5])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/d133/3131/6100/112c/0000/thumb/OK_TURCAUD_2013_CATALOGUE_50Pages-HD.png?1386672885", R.drawable.placeholder);
} else if (images[position].equals(images[6])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/d1e6/3131/6100/0e44/0000/thumb/OK_GODET_2013_CATALOGUE_50Pages-HD.png?1386672879", R.drawable.placeholder);
} else if (images[position].equals(images[7])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/cf96/3131/6100/1128/0000/thumb/OK_VOIX2013_CATALOGUE_50-PagesHD.png?1386672890", R.drawable.placeholder);
} else if (images[position].equals(images[8])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/c753/3131/6100/141a/0000/thumb/OK_ANNEAU-D-OR_2013_CATALOGUE_50Pages-HD.png?1386672902", R.drawable.placeholder);
} else if (images[position].equals(images[9])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/c854/3131/6100/1421/0000/thumb/OK_PHILIPPARIE_2013_CATALOGUE_50Pages-HD.png?1386672911", R.drawable.placeholder);
} else if (images[position].equals(images[10])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/c024/3131/6100/0e09/0000/thumb/OK_LANDREAU-BIJOUTIER_2013_CATALOGUE_50-Pages-HD.png?1386672915", R.drawable.placeholder);
} else if (images[position].equals(images[11])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/52a5/a9d4/3863/3700/020a/0000/thumb/OK_ANNE-OR-2013_CATALOGUE_50Pages-HD.png?1386672928", R.drawable.placeholder);
} else if (images[position].equals(images[12])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/52a8/8d54/3134/6400/0208/0000/thumb/OK_HERBERT-ROYAN_2013_CATALOGUE_50Pages-HD.png?1386777938", R.drawable.placeholder);
} else if (images[position].equals(images[13])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/thumbnails/5295/c9ed/3131/6100/1120/0000/thumb/COUV_Alain.png?1386679978", R.drawable.placeholder);
}
else if (images[position].equals(images[14])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/thumbnails/5295/bcfa/3131/6100/1403/0000/thumb/landreau-joaillier.png?1386925524", R.drawable.placeholder);
}
else if (images[position].equals(images[15])) {
// tv.setText(data[position]);
iv.setImageResource(R.drawable.bookletplaceholder);
UrlImageViewHelper.setUrlDrawable(iv, "http://s3.amazonaws.com/votre-bijoutier-resources/booklets/documents/5295/c674/3131/6100/0e23/0000/thumb/OK_DANIEL_2013_CATALOGUE_50Pages-HD.png?1386672854", R.drawable.placeholder);
}
return myview;
}
}
protected void onPostExecute(Void result) {
}
}
我的xml：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/grey"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".Home" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:background="@color/black" >
<ImageButton
android:id="@+id/imageButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="21dp"
android:background="@null"
android:src="@drawable/contactbutton" />
<ImageButton
android:id="@+id/imageButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignTop="@+id/imageButton2"
android:background="@null"
android:src="@drawable/backbutton" />
<ImageButton
android:id="@+id/imageButton5"
android:layout_width="100dp"
android:layout_height="75dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="13dp"
android:background="@null"
android:scaleType="fitXY"
android:src="@drawable/logo_alone" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/imageButton5"
android:layout_centerHorizontal="true"
android:scaleType="fitXY"
android:src="@drawable/booklettitle" />
<GridView
android:id="@+id/gridView"
android:layout_width="match_parent"
android:layout_height="325dp"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/imageView1"
android:layout_marginTop="16dp"
android:background="@color/white"
android:gravity="center"
android:numColumns="2"
android:verticalSpacing="5dp" >
</GridView>
<ImageButton
android:id="@+id/imageButton4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:background="@null"
android:layout_marginBottom="14dp"
android:src="@drawable/shoplistbutton" />
<ImageButton
android:id="@+id/imageButton6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/imageButton4"
android:layout_centerHorizontal="true"
android:background="@null"
android:src="@drawable/aroundme" />
<ImageButton
android:id="@+id/imageButton3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/imageButton6"
android:background="@null"
android:src="@drawable/philosophiebutton" />
</RelativeLayout>
</RelativeLayout>
我的Gidview单元格xml：
<?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:background="@drawable/bookletgradient" >
<ImageView
android:id="@+id/image"
android:layout_width="100dp"
android:layout_height="100dp"
android:src="@drawable/bookletplaceholder" />
</LinearLayout>
我的日志：
01-09 05:14:37.284: W/dalvikvm(1761): threadid=1: thread exiting with uncaught exception (group=0xb1a2ab90)
01-09 05:14:37.314: E/AndroidRuntime(1761): FATAL EXCEPTION: main
01-09 05:14:37.314: E/AndroidRuntime(1761): Process: com.b.votre, PID: 1761
01-09 05:14:37.314: E/AndroidRuntime(1761): java.lang.NullPointerException
01-09 05:14:37.314: E/AndroidRuntime(1761): at com.begital.votre.BookletsGridActivity$Custom_view.getView(BookletsGridActivity.java:355)
答案 0 :(得分：0)
根据您的意见：
iv.setImageResource(R.drawable.bookletplaceholder);
只有当iv为null时，您才能拥有NPE。
ImageView iv = (ImageView) myview.findViewById(R.id.imageView1);
如果null层次结构不包含具有该ID的视图，您将获得myView。
我使用不同的布局（一个用于智能手机，一个用于7“，一个用于10”）
确保智能手机特定的布局实际上包含ImageView，ID为imageView1。