我有一个扩展 Activity 的类，一切都很好！但我需要访问其中之一
此类中的函数，我无法将其定义为静态。....所以我制作了 Class 的副本（那个
扩展Activiy）并访问我的功能。如下 ：
Content content = new Content();
但在那之后我需要使用setContentView(R.layout.post_content);.but 应用程序崩溃
这条线。我认为那是因为我创建了Contetn.class.
感谢您的帮助....
package com.example.mysqlex;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import com.example.mysqlex.DbHandler;
import com.example.mysqlex.DbHelper;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.opengl.Visibility;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Html;
import android.text.Layout;
import android.util.Base64;
import android.util.Log;
import android.util.TypedValue;
import android.view.Display;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.content.Context;
import android.content.pm.PackageManager;
@SuppressLint("ResourceAsColor")
public class Content extends Activity {
static String Totalresult,catid;
static LinearLayout mainRel,popupRel;
static TextView title;
private static Context context;
private Typeface font;
Animation rotate,popupAnim,popupAnimHide,zoom_in;
public static Bitmap post_img_result;
public RelativeLayout popupLayout;
public Button closePopup_btn;
private DbHandler dbHandler=new DbHandler(this);
public DbHelper dbHelper=new DbHelper(this);
private SQLiteDatabase database;
public boolean onKeyDown(int keyCode, KeyEvent event, Menu menu)
{
//replaces the default 'Back' button action
if(keyCode==KeyEvent.KEYCODE_BACK){
super.onBackPressed();
overridePendingTransition( R.anim.move_left, R.anim.move_right );
}
return true;
}
public String BitMapToString(Bitmap bitmap){
ByteArrayOutputStream baos=new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG,100, baos);
byte [] b=baos.toByteArray();
String temp=Base64.encodeToString(b, Base64.DEFAULT);
return temp;
}
public Bitmap StringToBitMap(String encodedString){
try{
byte [] encodeByte=Base64.decode(encodedString,Base64.DEFAULT);
Bitmap bitmap=BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length);
return bitmap;
}catch(Exception e){
e.getMessage();
return null;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content);
context=this;
catid="catid"+this.getIntent().getStringExtra("catid");
mainRel=(LinearLayout) findViewById(R.id.mainRel);
rotate = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.rotate);
zoom_in = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.zoom_in);
popupAnim = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.popup);
popupAnimHide = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.popuphide);
if(dbHandler.getSettings("fontFamily", "value").equals("yekan2")){
font = Typeface.createFromAsset(getAssets(),"fonts/yekan2.TTF");
}else if(dbHandler.getSettings("fontFamily", "value").equals("yekan1")){
font = Typeface.createFromAsset(getAssets(),"fonts/yekan1.TTF");
}else{
font = Typeface.createFromAsset(getAssets(),"fonts/yekan2.TTF");
}
title=(TextView) findViewById(R.id.title);
TextView app_title=(TextView) findViewById(R.id.app_title);
app_title.setTypeface(font); title.setTypeface(font); title.setText(this.getIntent().getStringExtra("pageTitle"));
if(dbHandler.getSettings(catid, "value")=="null"){
Button btn = new Button(this);
LinearLayout Llayout = new LinearLayout(this);
btn.setBackgroundResource(R.drawable.post_drawable);
btn.setTextSize(TypedValue.COMPLEX_UNIT_DIP,19); btn.setTypeface(font); btn.setTextColor(R.color.white);
btn.setTag("noDataBtn");
btn.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
refresh_btn(arg0);
}
});
LayoutParams btnLp = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
LinearLayout.LayoutParams LLp = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
LLp.setMargins(0, 15, 0, 5);
btn.setLayoutParams(btnLp);
Llayout.setLayoutParams(LLp); Llayout.setGravity(0);
btn.setText(R.string.noDataMsg);
Llayout.addView(btn);
mainRel.addView(Llayout);
}else{
refresh("home");
}
}
public void refresh(final String refreshType){
dbHandler=new DbHandler(context);
dbHelper=new DbHelper(context);
if(refreshType=="button"){
if(dbHandler.getSettings(catid, "value").equals("null")){
dbHandler.insertSettings(catid, Totalresult, "");
}else{
dbHandler.updateSettings(catid, Totalresult, "");
}
}else if(refreshType=="home"){
Totalresult=dbHandler.getSettings(catid, "value");
}
if(dbHandler.getSettings("fontFamily", "value").equals("yekan2")){
font = Typeface.createFromAsset(context.getAssets(),"fonts/yekan2.TTF");
}else if(dbHandler.getSettings("fontFamily", "value").equals("yekan1")){
font = Typeface.createFromAsset(context.getAssets(),"fonts/yekan1.TTF");
}else{
font = Typeface.createFromAsset(context.getAssets(),"fonts/yekan2.TTF");
}
String[] childs=Totalresult.split("/.../<br />");
mainRel.removeAllViews();
for(int i=0; i<childs.length; i++){
String[] parts=childs[i].split("<br />");
final String[] title=parts[1].split("->");
final String[] id=parts[0].split("->");
final String[] introText=parts[3].split("->");
final String[] image=parts[4].split("->");
LinearLayout post = new LinearLayout(context); post.setOrientation(LinearLayout.VERTICAL);
post.setBackgroundResource(R.drawable.post_drawable);
RelativeLayout.LayoutParams post_Rparams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,RelativeLayout.LayoutParams.WRAP_CONTENT);
LinearLayout.LayoutParams post_Lparams = new LinearLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,RelativeLayout.LayoutParams.WRAP_CONTENT);
post_Lparams.setMargins(0, 10, 0, 10);
post.setLayoutParams(post_Lparams);
//post title Layout
LinearLayout titleLayout = new LinearLayout(context);
titleLayout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, 80));
titleLayout.setBackgroundResource(R.drawable.post_title);
post.addView(titleLayout);
//post title text
TextView post_title = new TextView(context);
LinearLayout.LayoutParams post_titleParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
post_titleParams.gravity=Gravity.CENTER_VERTICAL | Gravity.RIGHT;
post_title.setLayoutParams(post_titleParams);
post_title.setText(" :: "+title[1]);
post_title.setTextColor(Color.parseColor("#ffffff")); post_title.setTypeface(font); post_title.setTextSize(TypedValue.COMPLEX_UNIT_DIP,19);
titleLayout.addView(post_title);
//post content bg
LinearLayout contentL = new LinearLayout(context); contentL.setOrientation(LinearLayout.HORIZONTAL); contentL.setPadding(20, 30, 20, 30);
contentL.setBackgroundResource(R.drawable.post_drawable);
LinearLayout.LayoutParams post_contentParams = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
contentL.setLayoutParams(post_contentParams);
post.addView(contentL);
//post image
LinearLayout rightColumn=new LinearLayout(context); rightColumn.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams rightColumnP = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT);
rightColumn.setLayoutParams(rightColumnP);
ImageView post_img = new ImageView(context);
if(image.length>1){
String imgUrl = SigninActivity.url_2+image[1].toString();
if(refreshType=="button"){
new DownloadImageTask(post_img).execute(imgUrl,id[1],"button");
}else{
String img_name1="img"+id[1];
if(dbHandler.getSettings(img_name1, "value").equals("null")){
new DownloadImageTask(post_img).execute(imgUrl,id[1],"button");
}else{
Bitmap bitmap=StringToBitMap(dbHandler.getSettings(img_name1, "value"));
post_img.setImageBitmap(bitmap);
}
}
}else{
post_img.setImageResource(R.drawable.noimg_img);
}
LinearLayout.LayoutParams post_imgParams = new LinearLayout.LayoutParams(230, 230);
post_imgParams.gravity=Gravity.RIGHT; post_img.setScaleType(ScaleType.CENTER_CROP); post_imgParams.weight=1;
post_img.setLayoutParams(post_imgParams);
rightColumn.addView(post_img);
//post Intro Text
LinearLayout leftColumn=new LinearLayout(context); leftColumn.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams leftColumnP = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.FILL_PARENT);
leftColumn.setLayoutParams(leftColumnP);
TextView post_text = new TextView(context);
Integer lastInt=introText[1].substring(0, 150).lastIndexOf(" ");
String postText1=introText[1].substring(0, lastInt)+" ... ";
postText1= postText1.replaceAll("\\<.*?>", "");
post_text.setText(Html.fromHtml(postText1).toString());
post_text.setTypeface(font); post_text.setTextSize(TypedValue.COMPLEX_UNIT_DIP,15); post_text.setTextColor(Color.parseColor("#3F3F3F"));
LinearLayout.LayoutParams post_textParams = new LinearLayout.LayoutParams(400, 200);
post_textParams.gravity=Gravity.LEFT; post_textParams.weight=1; post_textParams.setMargins(0, 0, 15, 0);
post_text.setLayoutParams(post_textParams);
leftColumn.addView(post_text);
//post MoreText Buttton
final Button moreBtn = new Button(context);
moreBtn.setId(i);
moreBtn.setBackgroundResource(R.drawable.morebtn);
moreBtn.setText(R.string.readMore); moreBtn.setTypeface(font); moreBtn.setTextColor(Color.parseColor("#ffffff")); moreBtn.setTextSize(TypedValue.COMPLEX_UNIT_DIP,16);
LinearLayout.LayoutParams moreBtnParams = new LinearLayout.LayoutParams(230, 77);
moreBtnParams.gravity=Gravity.RIGHT;
moreBtnParams.setMargins(0, 10,0,0);
moreBtn.setLayoutParams(moreBtnParams);
rightColumn.addView(moreBtn);
//post Share Buttton
Button shareBtn = new Button(context);
shareBtn.setBackgroundResource(R.drawable.morebtn);
shareBtn.setCompoundDrawablesWithIntrinsicBounds(0, R.drawable.share,0 , 0);
LinearLayout.LayoutParams shareBtnParams = new LinearLayout.LayoutParams(77, 77);
shareBtnParams.gravity=Gravity.LEFT;
shareBtnParams.setMargins(0, 10, 0, 0);
shareBtn.setLayoutParams(shareBtnParams);
leftColumn.addView(shareBtn);
shareBtn.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
sharingIntent.setType("text/html");
sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, title[1]);
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "<!DOCTYPE html><html><head><title>"+Html.fromHtml(title[1])+"</title></head><body>"+Html.fromHtml(introText[1])+"</body></html>");
startActivity(Intent.createChooser(sharingIntent, "Share via"));
}
});
contentL.addView(rightColumn);
contentL.addView(leftColumn);
//right to left contentL :
ArrayList<View> views = new ArrayList<View>();
for(int x = 0; x < contentL.getChildCount(); x++) {
views.add(contentL.getChildAt(x));
}
contentL.removeAllViews();
for(int x = views.size() - 1; x >= 0; x--) {
contentL.addView(views.get(x));
}
mainRel.addView(post);
moreBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
setContentView(R.layout.post_content);
popupRel=(LinearLayout) findViewById(R.id.popupRel);
/*popupLayout=(RelativeLayout) findViewById(R.id.popupLayout);
popupLayout.startAnimation(popupAnim);
popupLayout.setVisibility(View.VISIBLE);*/
popupRel.removeAllViews();
//image
ImageView post_imgP = new ImageView(context);
if(image.length>1){
String imgUrl = SigninActivity.url_2+image[1].toString();
if(refreshType=="button"){
new DownloadImageTask(post_imgP).execute(imgUrl,id[1],"button");
}else{
String img_name1="img"+id[1];
if(dbHandler.getSettings(img_name1, "value").equals("null")){
new DownloadImageTask(post_imgP).execute(imgUrl,id[1],"button");
}else{
Bitmap bitmap=StringToBitMap(dbHandler.getSettings(img_name1, "value"));
post_imgP.setImageBitmap(bitmap);
}
}
}else{
post_imgP.setImageResource(R.drawable.noimg_img);
}
LinearLayout.LayoutParams post_img_paramsPopup=new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT , 400);
post_imgP.setScaleType(ScaleType.FIT_CENTER);
post_imgP.setLayoutParams(post_img_paramsPopup);
popupRel.addView(post_imgP);
//post Intro Text
TextView post_textP = new TextView(context);
post_textP.setText(Html.fromHtml(introText[1]));
post_textP.setTypeface(font); post_textP.setTextSize(TypedValue.COMPLEX_UNIT_DIP,18); post_textP.setTextColor(Color.parseColor("#FFFFFF"));
LinearLayout.LayoutParams post_textParams2 = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
post_textParams2.setMargins(15, 20, 15, 0);
post_textP.setLayoutParams(post_textParams2);
popupRel.addView(post_textP);
}
});
}
}
public void closeBtn(View arg0) {
popupLayout.startAnimation(popupAnimHide);
popupLayout.setVisibility(View.GONE);
}
public void post_img_resfresh(ImageView img, Bitmap bitmap, String id, String refresh_type){
dbHandler=new DbHandler(context);
dbHelper=new DbHelper(context);
String img_name="img"+id;
if(refresh_type=="button"){
if(dbHandler.getSettings(img_name, "value").equals("null")){
dbHandler.insertSettings(img_name,BitMapToString(bitmap) , "");
bitmap=StringToBitMap(dbHandler.getSettings(img_name, "value"));
}else{
dbHandler.updateSettings(img_name,BitMapToString(bitmap) , "");
bitmap=StringToBitMap(dbHandler.getSettings(img_name, "value"));
}
}else if(refresh_type=="home"){
bitmap=StringToBitMap(dbHandler.getSettings(img_name, "value"));
}
img.setImageBitmap(bitmap);
}
public void refresh_btn(View v) {
if(v.getTag()!="noDataBtn"){
v.startAnimation(rotate);
}
if(Main.haveNetworkConnection()){
SigninActivity.classReferrer="Content";
new SigninActivity(this,0).execute("site_id","1","catid",this.getIntent().getStringExtra("catid"),"data_type","echo(/.../)");
}else{
Toast.makeText(getApplicationContext(), R.string.noInternetConnection, Toast.LENGTH_LONG).show();
}
}
public void exit_btn(View v) {
finish();
}
public void settings_btn(View v) {
Intent goToSettings = new Intent(v.getContext(), Settings.class);
v.getContext().startActivity(goToSettings);
((Activity) v.getContext()).overridePendingTransition( R.anim.zoom_out,R.anim.zoom_in );
}
public void about_btn(View v) {
Intent goToAbout = new Intent(v.getContext(), About.class);
v.getContext().startActivity(goToAbout);
((Activity) v.getContext()).overridePendingTransition( R.anim.zoom_out,R.anim.zoom_in );
}
public void back_btn(View v) {
Intent goToMain = new Intent(Content.this, Main.class);
startActivity(goToMain);
overridePendingTransition( R.anim.move_left, R.anim.move_right );
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.about:
Intent goToAbout = new Intent(Content.this, About.class);
startActivity(goToAbout);
overridePendingTransition( R.anim.zoom_out,R.anim.zoom_in );
return true;
case R.id.refresh:
if(Main.haveNetworkConnection()){
SigninActivity.classReferrer="Content";
new SigninActivity(this,0).execute("site_id","1","catid",this.getIntent().getStringExtra("catid"),"echo(/.../)");
}else{
Toast.makeText(getApplicationContext(), R.string.noInternetConnection, Toast.LENGTH_LONG).show();
}
return true;
case R.id.help:
Intent goToHelp = new Intent(Content.this, Help.class);
startActivity(goToHelp);
overridePendingTransition( R.anim.zoom_out,R.anim.zoom_in );
return true;
case R.id.exit:
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(1);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
`08-16 13:43:33.429: E/Trace(22297): error opening trace file: No such file or directory (2)
08-16 13:44:18.127: E/AndroidRuntime(22297): FATAL EXCEPTION: main
08-16 13:44:18.127: E/AndroidRuntime(22297): java.lang.NullPointerException
08-16 13:44:18.127: E/AndroidRuntime(22297): at
android.app.Activity.setContentView(Activity.java:1912)
08-16 13:44:18.127: E/AndroidRuntime(22297): at com.example.mysqlex.Content$3.onClick(Content.java:306)
08-16 13:44:18.127: E/AndroidRuntime(22297): at android.view.View.performClick(View.java:4102)
08-16 13:44:18.127: E/AndroidRuntime(22297): at
android.view.View$PerformClick.run(View.java:17085)
08-16 13:44:18.127: E/AndroidRuntime(22297): at android.os.Handler.handleCallback(Handler.java:615)
08-16 13:44:18.127: E/AndroidRuntime(22297): at android.os.Handler.dispatchMessage(Handler.java:92)
08-16 13:44:18.127: E/AndroidRuntime(22297): at android.os.Looper.loop(Looper.java:155)
08-16 13:44:18.127: E/AndroidRuntime(22297): at android.app.ActivityThread.main(ActivityThread.java:5511)
08-16 13:44:18.127: E/AndroidRuntime(22297): at
java.lang.reflect.Method.invokeNative(Native Method)
08-16 13:44:18.127: E/AndroidRuntime(22297): at java.lang.reflect.Method.invoke(Method.java:511)
08-16 13:44:18.127: E/AndroidRuntime(22297): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
08-16 13:44:18.127: E/AndroidRuntime(22297): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)
08-16 13:44:18.127: E/AndroidRuntime(22297): at dalvik.system.NativeStart.main(Native Method)`