我使用自定义ActionBar进行导航，例如A - ＆gt; B - ＆gt; c，c - ＆gt; B - ＆gt;一个。 在应用程序导航A - ＆gt; B - ＆gt; c单击C到 - >＆gt;正常工作B，妈妈我得到运行时异常。我的logCat添加贝娄.......
............. SublistBrowserCatalog .class ................
public class SublistBrowserCatalog extends Activity{
ArrayAdapter<String> adapter;
private String name,title;
private DatabaseHelper dbHeplper;
private ListView lvUsers;
private List<JSONObject> listItem;
static Bundle resStr;
private static List<JSONObject> list_info;
// public String Hose_Name;
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.browse_catalog);
Log.v("BrowserCatalog", "BrowserCatalog");
resStr = getIntent().getExtras();
name = resStr.getString("bhh", null);
title = resStr.getString("name", null);
//getActionBar().setTitle(name);
System.out.println(".....................>>"+title);
ActionBar mActionBar = getActionBar();
mActionBar.setDisplayShowHomeEnabled(false);
mActionBar.setDisplayShowTitleEnabled(false);
LayoutInflater mInflater = LayoutInflater.from(this);
View mCustomView = mInflater.inflate(R.layout.custom_actionbar, null);
TextView mTitleTextView = (TextView) mCustomView.findViewById(R.id.title_text);
mTitleTextView.setText(title);
ImageButton imageB = (ImageButton) mCustomView
.findViewById(R.id.backb);
imageB.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), BrokerSubList.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i);
}
});
ImageButton imageButton = (ImageButton) mCustomView
.findViewById(R.id.imageButton);
imageButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), MainActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i);
}
});
mActionBar.setCustomView(mCustomView);
mActionBar.setDisplayShowCustomEnabled(true);
list_info = new ArrayList<JSONObject>();
dbHeplper = new DatabaseHelper(getApplicationContext());
try {
dbHeplper.createDataBase();
} catch (IOException e) {
e.printStackTrace();
}
lvUsers = (ListView)findViewById(R.id.pr_enginslist);
listItem = dbHeplper.getAllData();
for(int j=0;j<listItem.size();j++){
try {
//Log.v("DDD", Boolean.toString((listItem.get(j).get("type").toString().toLowerCase().replace(" ", "")).contains(name.toLowerCase().replace(" ", ""))));
if(listItem.get(j).get("type").toString().toLowerCase().trim().equalsIgnoreCase(name.toLowerCase().trim())){
//Log.v("DDD", listItem.get(j).get("type").toString());
list_info.add(listItem.get(j));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
lvUsers.setAdapter(new EfficientAdapter(this));
}
private static class EfficientAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private Context context;
public EfficientAdapter(Context context) {
this.context = context;
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return SublistBrowserCatalog.list_info.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
static class ViewHolder {
TextView text1;
TextView text2;
ImageView hoses;
}
@Override
public View getView(final int position, View convertView, ViewGroup arg2) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.customview_item, null);
holder = new ViewHolder();
holder.text1 = (TextView) convertView .findViewById(R.id.pr_name);
holder.text2 = (TextView)convertView.findViewById(R.id.sample_text);
holder.hoses = (ImageView)convertView.findViewById(R.id.icon);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
try {
holder.text1.setText(list_info.get(position).get("product").toString());
holder.text2.setText(list_info.get(position).get("name").toString());
InputStream open = context.getAssets().open("Hoses_Images/"+list_info.get(position).get("i_name").toString());
System.out.println(";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;"+list_info.get(position).get("i_name").toString());
Bitmap bitmap = BitmapFactory.decodeStream(open);
holder.hoses.setImageBitmap(bitmap);
holder.hoses.setTag(list_info.get(position));
} catch (Exception e) {
e.printStackTrace();
}
convertView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent pk_web = new Intent(context, SublistParkerwebView.class);
pk_web.putExtra("viewObj", list_info.get(position).toString());
pk_web.putExtra("bc", "Browseatalog");
pk_web.putExtra("name", resStr.getString("name", null));
pk_web.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
context.startActivity(pk_web);
}
});
return convertView;
}
}
}
............. SublistParkerwebView.class ..................
public class SublistParkerwebView extends Activity{
JSONObject pkObj;
JSONObject oneJB;
WebView mWebView = null;
Button SendIt;
String Title,ramu,title;
String Hoses = "file:///android_asset/Hoses_Images/";
String FilePath;
private String email_subject;
File file,newDir,files,newDirs;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.pk_webview);
Button pk_webBt = (Button) findViewById(R.id.pk_webBt);
SendIt = (Button) findViewById(R.id.sendto);
Intent intent = getIntent();
Bundle resStr = getIntent().getExtras();
title = resStr.getString("name", null);
ramu = resStr.getString("bc", null);
ActionBar mActionBar = getActionBar();
mActionBar.setDisplayShowHomeEnabled(false);
mActionBar.setDisplayShowTitleEnabled(false);
LayoutInflater mInflater = LayoutInflater.from(this);
View mCustomView = mInflater.inflate(R.layout.custom_actionbar, null);
TextView mTitleTextView = (TextView) mCustomView.findViewById(R.id.title_text);
mTitleTextView.setText(title);
ImageButton imageB = (ImageButton) mCustomView.findViewById(R.id.backb);
imageB.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
if (ramu.toString().equals("Browseatalog")) {
Toast.makeText(getApplicationContext(), "IH", Toast.LENGTH_LONG).show();
Intent i = new Intent(getApplicationContext(), StampCatalog.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
}else {
Toast.makeText(getApplicationContext(), "sublist", Toast.LENGTH_LONG).show();
}
}
});
ImageButton imageButton = (ImageButton) mCustomView
.findViewById(R.id.imageButton);
imageButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Intent i = new Intent(getApplicationContext(), MainActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i);
}
});
mActionBar.setCustomView(mCustomView);
mActionBar.setDisplayShowCustomEnabled(true);
try {
Log.v("get string from another class", intent.getStringExtra("viewObj"));
pkObj = new JSONObject(intent.getStringExtra("viewObj"));
System.out.println("pkObj =====>"+pkObj);
Title = pkObj.getString("name");
System.out.println("Title =====>"+Title);
Log.d("OutPut", pkObj.getString("name"));
} catch (JSONException e) {
e.printStackTrace();
}
try {
pkObj = new JSONObject(intent.getStringExtra("viewObj"));
String string = "file:///android_asset/Hoses_Images/hyd_"+pkObj.getString("i_desc").toString();
Log.v("URL =====================", string);
try{
InputStream open = getAssets().open("Hoses_Images/hyd_"+pkObj.getString("i_desc"));
Bitmap bitmp = BitmapFactory.decodeStream(open);
String root = Environment.getExternalStorageDirectory().toString();
newDirs = new File(root + "/Parker");
if(!newDirs.exists())
newDirs.mkdirs();
String pn = "details.png";
files = new File (newDirs, pn);
if (files.exists ()) files.delete ();
FileOutputStream rm = new FileOutputStream(files);
bitmp.compress(Bitmap.CompressFormat.JPEG, 90, rm);
rm.flush();
rm.close();
bitmp.recycle();
} catch (Exception e) {
e.printStackTrace();
}
} catch (JSONException e) {
e.printStackTrace();
}
try {
if (pkObj.getString("eqpVal") != null) {
pk_webBt.setVisibility(ImageButton.GONE);
}
} catch (JSONException e1) {
e1.printStackTrace();
}
mWebView = (WebView) findViewById(R.id.pk_webId);
mWebView.getSettings().setJavaScriptEnabled(true);
try {
mWebView.loadUrl(Hoses + pkObj.getString("f_name").toString());
Log.d("ImagePath", Hoses + pkObj.getString("i_name").toString());
FilePath = Hoses + pkObj.getString("i_name").toString();
try {
InputStream is = getAssets().open("Hoses_Images/"+pkObj.getString("f_name"));
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
email_subject = new String(buffer);
InputStream open = getAssets().open("Hoses_Images/"+pkObj.getString("i_name"));
Bitmap bitmap = BitmapFactory.decodeStream(open);
String root = Environment.getExternalStorageDirectory().toString();
newDir = new File(root + "/Parker");
if(!newDir.exists())
newDir.mkdirs();
String fotoname = "Photo.png";
file = new File (newDir, fotoname);
if (file.exists ()) file.delete ();
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
bitmap.recycle();
} catch (Exception e) {
e.printStackTrace();
}
} catch (JSONException e) {
e.printStackTrace();
}
pk_webBt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent pk_web = new Intent(getApplicationContext(),
ParkerTiff.class);
try {
pk_web.putExtra("webObj", pkObj.getString("i_desc")
.toString());
} catch (JSONException e) {
e.printStackTrace();
}
startActivity(pk_web);
}
});
SendIt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent emailIntent = new Intent(Intent.ACTION_SEND_MULTIPLE, Uri.fromParts("mailto","", null));
emailIntent.setType("image/png");
emailIntent.setClassName("com.google.android.gm", "com.google.android.gm.ComposeActivityGmail");
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Parker");
emailIntent.putExtra(Intent.EXTRA_TEXT, Html.fromHtml(email_subject));
emailIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
ArrayList<Uri> uris = new ArrayList<Uri>();
String[] filePaths = new String[] {"sdcard/Parker/Photo.png", "sdcard/Parker/details.png"};
System.out.println("filePaths =====>"+filePaths);
for (String file : filePaths)
{
File fileIn = new File(file);
Uri u = Uri.fromFile(fileIn);
uris.add(u);
}
emailIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
startActivity(Intent.createChooser(emailIntent,"Send"));
try {
startActivity(Intent.createChooser(emailIntent, "Choose an email client from..."));
} catch (android.content.ActivityNotFoundException ex) {
}
}
});
}
}
..............我的logCat ....................
11-05 01:21:52.993: V/BrowserCatalog(7529): BrowserCatalog
11-05 01:21:52.993: D/AndroidRuntime(7529): Shutting down VM
11-05 01:21:52.993: W/dalvikvm(7529): threadid=1: thread exiting with uncaught exception (group=0x55da4b20)
11-05 01:21:52.993: I/Process(7529): Sending signal. PID: 7529 SIG: 9
11-05 01:21:52.993: D/AndroidRuntime(7529): procName from cmdline: com.parker
11-05 01:21:52.993: E/AndroidRuntime(7529): in writeCrashedAppName, pkgName :com.parker
11-05 01:21:52.993: D/AndroidRuntime(7529): file written successfully with content: com.parker StringBuffer : ;com.parker
11-05 01:21:52.993: E/AndroidRuntime(7529): FATAL EXCEPTION: main
11-05 01:21:52.993: E/AndroidRuntime(7529): Process: com.parker, PID: 7529
11-05 01:21:52.993: E/AndroidRuntime(7529): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.parker/com.parker.SublistBrowserCatalog}: java.lang.NullPointerException
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.app.ActivityThread.access$800(ActivityThread.java:135)
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.os.Handler.dispatchMessage(Handler.java:102)
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.os.Looper.loop(Looper.java:136)
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.app.ActivityThread.main(ActivityThread.java:5021)
11-05 01:21:52.993: E/AndroidRuntime(7529): at java.lang.reflect.Method.invokeNative(Native Method)
11-05 01:21:52.993: E/AndroidRuntime(7529): at java.lang.reflect.Method.invoke(Method.java:515)
11-05 01:21:52.993: E/AndroidRuntime(7529): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827)
11-05 01:21:52.993: E/AndroidRuntime(7529): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)
11-05 01:21:52.993: E/AndroidRuntime(7529): at dalvik.system.NativeStart.main(Native Method)
11-05 01:21:52.993: E/AndroidRuntime(7529): Caused by: java.lang.NullPointerException
11-05 01:21:52.993: E/AndroidRuntime(7529): at com.parker.SublistBrowserCatalog.onCreate(SublistBrowserCatalog.java:59)
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.app.Activity.performCreate(Activity.java:5231)
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1090)
11-05 01:21:52.993: E/AndroidRuntime(7529): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
11-05 01:21:52.993: E/AndroidRuntime(7529): ... 11 more
答案 0 :(得分：0)
你得到这个，因为你在com.parker.Dummy.onCreate（Dummy.java:44）得到NullPointerException。