MainActivity.java
package com.pKLabs.RgpvDigest;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.ads.AdListener;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.InterstitialAd;
import cssyllabus.MainCS;
import static com.pKLabs.RgpvDigest.R.layout.activity_main;
public class MainActivity extends ActionBarActivity implements
OnItemClickListener, AnimationListener {
private DrawerLayout drawerLayout;
private ListView listView;
private ActionBarDrawerToggle drawerListner;
TextView t, t1, t2, t3, t4, t5;
Animation rotation, anim;
private MyAdapter myAdapter;
private static final String AD_UNIT_ID = "ca-app-pub-8935153656417807/4125750777";
private static final String TAG = "MainActivity";
private InterstitialAd iAd;
ImageView iv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
anim = new AlphaAnimation(0.0f, 1.0f);
anim.setDuration(60); // You can manage the blinking time with this
// parameter
anim.setStartOffset(30);
anim.setRepeatMode(Animation.REVERSE);
anim.setRepeatCount(2);
iv = (ImageView) findViewById(R.id.imageView1);
rotation = AnimationUtils.loadAnimation(getApplicationContext(),
R.anim.button_rotate);
rotation.setRepeatCount(Animation.INFINITE);
rotation.setAnimationListener(MainActivity.this);
iv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
iv.startAnimation(rotation);
t1.startAnimation(anim);
t2.startAnimation(anim);
t3.startAnimation(anim);
t4.startAnimation(anim);
t5.startAnimation(anim);
}
});
t = (TextView) findViewById(R.id.rgpvtext);
t.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
iv.startAnimation(rotation);
t1.startAnimation(anim);
t2.startAnimation(anim);
t3.startAnimation(anim);
t4.startAnimation(anim);
t5.startAnimation(anim);
}
});
Typeface tf = Typeface.createFromAsset(getApplicationContext()
.getAssets(), "segoe.ttf");
TextView t = (TextView) findViewById(R.id.rgpvtext);
t.setTypeface(tf);
t.setTypeface(tf, tf.BOLD);
iAd = new InterstitialAd(this);
iAd.setAdUnitId(AD_UNIT_ID);
iAd.setAdListener(new AdListener() {
@Override
public void onAdLoaded() {
}
@Override
public void onAdFailedToLoad(int errorCode) {
}
});
loadInterstitial();
listView = (ListView) findViewById(R.id.drawerlist);
myAdapter = new MyAdapter(this);
listView.setAdapter(myAdapter);
listView.setOnItemClickListener(this);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerListner = new ActionBarDrawerToggle(this, drawerLayout,
R.drawable.ic_drawer, R.string.dopen, R.string.dclose);
drawerLayout.setDrawerListener(drawerListner);
getSupportActionBar().setHomeButtonEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
t1 = (TextView) findViewById(R.id.compu);
t1.setPaintFlags(Paint.UNDERLINE_TEXT_FLAG);
t1.setTypeface(tf);
t1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), Semester.class);
startActivityForResult(intent, 0);
}
});
t2 = (TextView) findViewById(R.id.calc);
t2.setPaintFlags(Paint.UNDERLINE_TEXT_FLAG);
t2.setTypeface(tf);
t2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), Calculator.class);
startActivityForResult(intent, 0);
}
});
t3 = (TextView) findViewById(R.id.iv);
t3.setPaintFlags(Paint.UNDERLINE_TEXT_FLAG);
t3.setTypeface(tf);
t3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(),
InterviewQuestion.class);
startActivityForResult(intent, 0);
}
});
t4 = (TextView) findViewById(R.id.prog);
t4.setPaintFlags(Paint.UNDERLINE_TEXT_FLAG);
t4.setTypeface(tf);
t4.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(v.getContext(), Programs.class);
startActivityForResult(intent, 0);
}
});
t5 = (TextView) findViewById(R.id.abo);
t5.setPaintFlags(Paint.UNDERLINE_TEXT_FLAG);
t5.setTypeface(tf);
t5.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), About.class);
startActivityForResult(intent, 0);
}
});
}
private void loadInterstitial() {
// TODO Auto-generated method stub
AdRequest adRequest = new AdRequest.Builder().build();
iAd.loadAd(adRequest);
System.out.println("Ad loaded success");
}
public void showInterstitial() {
if (iAd.isLoaded()) {
iAd.show();
System.out.println("Ad shown success");
} else {
Log.d(TAG, "Interstitial ad is not loaded yet");
}
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
// TODO Auto-generated method stub
super.onConfigurationChanged(newConfig);
drawerListner.onConfigurationChanged(newConfig);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onPostCreate(savedInstanceState);
drawerListner.syncState();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuItem item = menu.add("share"); // your desired title here
item.setIcon(R.drawable.share_icon); // your desired icon here
item.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
item.setOnMenuItemClickListener(new OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
try
{ Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_SUBJECT, "RGPV Digest");
String sAux = "Looking to score high in RGPV ?\n Try out this app :\n\n";
sAux = sAux + "https://play.google.com/store/apps/details?id=" + getApplicationContext().getPackageName();
i.putExtra(Intent.EXTRA_TEXT, sAux);
startActivity(Intent.createChooser(i, "Share via"));
}
catch(Exception e)
{ //e.toString();
}
return true;
}
});
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
if (drawerListner.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
if (position == 0) {
Uri uri = Uri
.parse("https://2ce74af0d8de8783b91cdd315eeba0340a4b9277.googledrive.com/host/0B2sDUzNeIK0KODB0ZDRMVjFPaFE/Jobs.html");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
} else if (position == 1) {
Intent intent = new Intent(this, MainCS.class);
startActivityForResult(intent, 0);
} else if (position == 2) {
Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
"mailto","laboratorypk@gmail.comm", null));
intent.putExtra(Intent.EXTRA_SUBJECT, "Project Help");
intent.putExtra(Intent.EXTRA_TEXT,"Please write a short description of your project and technology you are supposed to use.");
startActivity(Intent.createChooser(intent, "Choose an Email client :"));
}
// }
else if (position == 3) {
Intent intent = new Intent(this, Careerguid.class);
startActivityForResult(intent, 0);
}
else if (position == 4) {
Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
"mailto","laboratorypk@gmail.comm", null));
intent.putExtra(Intent.EXTRA_SUBJECT, "PC Games");
intent.putExtra(Intent.EXTRA_TEXT,"Hey! I need PC Games pls share the list of Games that you have.");
startActivity(Intent.createChooser(intent, "Choose an Email client :"));
}
else if (position == 5) {
Uri uri = Uri.parse("market://details?id=" + getApplicationContext().getPackageName());
Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
try {
startActivity(goToMarket);
} catch (ActivityNotFoundException e) {
startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("http://play.google.com/store/apps/details?id=" + getApplicationContext().getPackageName())));
}
}
else if (position == 6) {
Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(
"mailto","laboratorypk@gmail.comm", null));
intent.putExtra(Intent.EXTRA_SUBJECT, "Query/Feedback");
intent.putExtra(Intent.EXTRA_TEXT,"");
startActivity(Intent.createChooser(intent, "Choose an Email client :"));
}
drawerLayout.closeDrawers();
selectItem(position);
}
public void selectItem(int position) {
// TODO Auto-generated method stub
listView.setItemChecked(position, true);
}
public void setTitle(String title) {
getSupportActionBar().setTitle(title);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
showInterstitial();
super.onDestroy();
}
private Toast toast;
private long lastBackPressTime = 0;
@Override
public void onBackPressed() {
if (this.lastBackPressTime < System.currentTimeMillis() - 4000) {
toast = Toast.makeText(this, "Press back again to exit",
Toast.LENGTH_LONG);
toast.show();
this.lastBackPressTime = System.currentTimeMillis();
drawerLayout.closeDrawers();
} else {
if (toast != null) {
toast.cancel();
}
super.onBackPressed();
}
}
@Override
public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationEnd(Animation animation) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub
}
}
class MyAdapter extends BaseAdapter {
private Context context;
String[] navlist;
int[] images = { R.drawable.job, R.drawable.facebook, R.drawable.project,
R.drawable.career, R.drawable.games, R.drawable.rate, R.drawable.mail };
public MyAdapter(Context context) {
this.context = context;
navlist = context.getResources().getStringArray(R.array.navdra);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return navlist.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return navlist[position];
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = null;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.customrow, parent, false);
}
else {
row = convertView;
}
TextView titleTextView = (TextView) row.findViewById(R.id.textView11);
ImageView titleImageView = (ImageView) row
.findViewById(R.id.imageView1);
titleTextView.setText(navlist[position]);
titleImageView.setImageResource(images[position]);
return row;
}
}
这是activity_main.xml
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/ab" >
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="135dp"
android:layout_height="135dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="30dp"
android:src="@drawable/rgpvicon" />
<TextView
android:id="@+id/rgpvtext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/imageView1"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginTop="6dp"
android:clickable="true"
android:text="RGPV Digest"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@drawable/texteff"
android:textSize="36sp" />
<TextView
android:id="@+id/compu"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/rgpvtext"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_marginTop="25dp"
android:clickable="true"
android:text="Computer Science"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@drawable/texteff"
android:textSize="24sp" />
<TextView
android:id="@+id/calc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/compu"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:clickable="true"
android:text="Calculator"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@drawable/texteff"
android:textSize="24sp" />
<TextView
android:id="@+id/iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/calc"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:clickable="true"
android:text="Interview Question"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@drawable/texteff"
android:textSize="24sp" />
<TextView
android:id="@+id/prog"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/iv"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:clickable="true"
android:text="Programs"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@drawable/texteff"
android:textSize="24sp" />
<TextView
android:id="@+id/abo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/prog"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:clickable="true"
android:text="About"
android:paddingBottom="20dp"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@drawable/texteff"
android:textSize="24sp" />
</RelativeLayout>
</ScrollView>
</LinearLayout>
<ListView
android:id="@+id/drawerlist"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="left"
android:background="#4ABC96"
android:paddingTop="6dp" />
</android.support.v4.widget.DrawerLayout>
LOG：
Process: com.pKLabs.RgpvDigest, PID: 1557
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pKLabs.RgpvDigest/com.pKLabs.RgpvDigest.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.pKLabs.RgpvDigest.MainActivity.onCreate(MainActivity.java:146)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
07-23 07:04:44.900 409-763/? W/ActivityManager﹕ Force finishing activity com.pKLabs.RgpvDigest/.MainActivity
07-23 07:04:45.080 409-428/? D/dalvikvm﹕ GC_FOR_ALLOC freed 312K, 54% free 5989K/12960K, paused 98ms, total 101ms
07-23 07:04:45.410 1557-1574/? D/dalvikvm﹕ DexOpt: --- BEGIN 'ads1355421311.jar' (bootstrap=0) ---
07-23 07:04:45.510 409-428/? I/Choreographer﹕ Skipped 38 frames! The application may be doing too much work on its main thread.
无法弄清楚我做错了什么，我更新了android studio并下载了API 22，之后我在Gradle中也遇到了很多错误。我有些修复了但是运行时错误我该如何修复请帮帮我。
答案 0 :(得分：0)
您的活动是否已添加到清单中？
答案 1 :(得分：0)
使用getSupportActionBar()代替getActionBar()。
使用
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
而不是
getActionBar().setDisplayHomeAsUpEnabled(true);
再次运行应用程序。