【发布时间】：2016-04-04 10:58:04
【问题描述】：
此活动运行良好。但我需要将 Activity 作为一个片段。我试图将活动更改为片段，但它不起作用....那么有人可以帮我改变吗？？
import android.app.Activity;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.pm.ResolveInfo;
import android.graphics.Typeface;
import android.os.AsyncTask;
import android.os.BatteryManager;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.google.analytics.tracking.android.GoogleAnalytics;
import com.google.analytics.tracking.android.Tracker;
import com.mobilemerit.batterychecker.App;
import com.mobilemerit.java.GetBatteryStats;
public class BatteryCheck extends Activity {
private TextView bLevel, header, health, voltage, tech, temp,
heath_tag,temp_tag,tech_tag,voltage_tag;
private ProgressBar bProgress;
private ImageButton cheakUsage;
private int level;
private Intent usageIntent;
private ResolveInfo resolveInfo;
private Typeface myTypeface,secondrayTypeFace;
private Tracker tracker;
private GoogleAnalytics gTracker;
private ImageButton batteryTester;
public static final String LEVEL="level";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.battery_check_new);
/**
* feeding the context of thw application
* So as to use this at various places
*
* */
new App(getApplicationContext());
// Attaching the Font type with the Text Views
myTypeface = Typeface.createFromAsset(getAssets(), "fonts/Franklin Gothic.otf");
secondrayTypeFace=Typeface.createFromAsset(getAssets(),"fonts/GOTHIC.TTF" );
/**
* Google Analytic code
*/
gTracker = GoogleAnalytics.getInstance(getApplicationContext());
tracker = gTracker.getTracker("UA-41735784-1");
// Finding the XML Views
bLevel = (TextView) findViewById(R.id.blevel1);
bProgress = (ProgressBar) findViewById(R.id.progressBar);
cheakUsage = (ImageButton) findViewById(R.id.usage);
header = (TextView) findViewById(R.id.header);
tech = (TextView) findViewById(R.id.technology);
temp = (TextView) findViewById(R.id.tempreture);
voltage = (TextView) findViewById(R.id.voltage);
health = (TextView) findViewById(R.id.health);
/**find up the tags view(of stats textviews) as well to set up the typeface */
heath_tag=(TextView)this.findViewById(R.id.health_tag);
tech_tag=(TextView)this.findViewById(R.id.technology_tag);
temp_tag=(TextView)this.findViewById(R.id.temp_tag);
voltage_tag=(TextView)this.findViewById(R.id.voltage_tag);
heath_tag.setTypeface(secondrayTypeFace);
tech_tag.setTypeface(secondrayTypeFace);
temp_tag.setTypeface(secondrayTypeFace);
voltage_tag.setTypeface(secondrayTypeFace);
/** Code for Google Admob */
bLevel.setTypeface(myTypeface);
header.setTypeface(myTypeface);
// register the Broadcast Receiver
this.registerReceiver(this.batteryInfoReceiver, new IntentFilter(
Intent.ACTION_BATTERY_CHANGED));
// Setting up the Intent for the Power Usage details
usageIntent = new Intent(Intent.ACTION_POWER_USAGE_SUMMARY);
// Check it for presence
resolveInfo = getPackageManager().resolveActivity(usageIntent, 0);
if (resolveInfo == null) {
Toast.makeText(this, "Not Support!", Toast.LENGTH_LONG).show();
cheakUsage.setEnabled(false);
} else {
cheakUsage.setEnabled(true);
}
// Setting up the functionality of the Button Clicks
cheakUsage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(usageIntent);
}
});
}
private BroadcastReceiver batteryInfoReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
setUpStats(intent);
// Toast.makeText(getBaseContext(),
// ""+intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE,-1),Toast.LENGTH_SHORT).show();
new ShowProgressClass().execute();
}
};
public void setUpStats(Intent intent) {
GetBatteryStats stats = new GetBatteryStats(intent);
health.setText("" + stats.getBatteryHealth());
tech.setText("" + stats.getBatteryTechnology());
temp.setText("" + stats.getBatteryTempreture());
voltage.setText("" + stats.getBatteryVoltage());
//Setting up typefaces for the stats
health.setTypeface(secondrayTypeFace);
tech.setTypeface(secondrayTypeFace);
temp.setTypeface(secondrayTypeFace);
voltage.setTypeface(secondrayTypeFace);
/**Save current voltage and level to calculate the Remaining time on Battery*/
SharedPreferences prefs=this.getSharedPreferences(LEVEL, Context.MODE_PRIVATE);
prefs.edit().putString("level",""+level);
prefs.edit().putString("voltage",stats.getBatteryVoltage());
}
// For Upadating progress bar After loading
class ShowProgressClass extends AsyncTask<Void, Integer, Void> {
@Override
protected Void doInBackground(Void... params) {
for (int i = 0; i < level; i++) {
publishProgress(1);
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// TODO Auto-generated method stub
return null;
}
@Override
protected void onPreExecute() {
bProgress.setMax(100);
bProgress.setProgress(0);
// TODO Auto-generated method stub
}
@Override
protected void onProgressUpdate(Integer... values) {
bProgress.incrementProgressBy(values[0]);
bLevel.setText(" " + bProgress.getProgress() + "%");
// TODO Auto-generated method stub
}
}
@Override
public boolean onKeyDown(int keycode, KeyEvent event) {
if (keycode == KeyEvent.KEYCODE_BACK) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
alertDialog.setTitle("Alert");
// Setting Dialog Message
alertDialog.setMessage("Are you sure you want to quit?");
// Setting Positive "Yes" Button
alertDialog.setPositiveButton("YES",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
onDestroy();
}
});
// Setting Negative "NO" Button
alertDialog.setNegativeButton("NO",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to invoke NO event
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
return super.onKeyDown(keycode, event);
}
@Override
protected void onDestroy() {
super.onDestroy();
android.os.Process.killProcess(android.os.Process.myPid());
}
}
我尝试自己将代码转换为片段，代码如下： 转换后我得到了什么：
package com.raihanbd.easyrambooster;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.content.pm.ResolveInfo;
import android.graphics.Typeface;
import android.os.AsyncTask;
import android.os.BatteryManager;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.google.analytics.tracking.android.GoogleAnalytics;
import com.google.analytics.tracking.android.Tracker;
import com.mobilemerit.batterychecker.App;
import com.mobilemerit.java.GetBatteryStats;
public class BatteryCheck extends Fragment implements OnClickListener {
private TextView bLevel, header, health, voltage, tech, temp,
heath_tag,temp_tag,tech_tag,voltage_tag;
private ProgressBar bProgress;
private ImageButton cheakUsage;
private int level;
private Intent usageIntent;
private ResolveInfo resolveInfo;
private Typeface myTypeface,secondrayTypeFace;
private Tracker tracker;
private GoogleAnalytics gTracker;
private ImageButton batteryTester;
public static final String LEVEL="level";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.battery_check_new, container, false);
/**
* feeding the context of thw application
* So as to use this at various places
*
* */
new App(getActivity().getApplicationContext());
// Attaching the Font type with the Text Views
// myTypeface = Typeface.createFromAsset(getAssets(), "fonts/Franklin Gothic.otf");
// secondrayTypeFace=Typeface.createFromAsset(getAssets(),"fonts/GOTHIC.TTF" );
/**
* Google Analytic code
*/
gTracker = GoogleAnalytics.getInstance(getActivity().getApplicationContext());
tracker = gTracker.getTracker("UA-41735784-1");
// Finding the XML Views
bLevel = (TextView) getView().findViewById(R.id.blevel1);
bProgress = (ProgressBar) getView().findViewById(R.id.progressBar);
cheakUsage = (ImageButton) getView().findViewById(R.id.usage);
header = (TextView) getView().findViewById(R.id.header);
tech = (TextView) getView().findViewById(R.id.technology);
temp = (TextView) getView().findViewById(R.id.tempreture);
voltage = (TextView) getView().findViewById(R.id.voltage);
health = (TextView) getView().findViewById(R.id.health);
/**find up the tags view(of stats textviews) as well to set up the typeface */
heath_tag=(TextView)this.getView().findViewById(R.id.health_tag);
tech_tag=(TextView)this.getView().findViewById(R.id.technology_tag);
temp_tag=(TextView)this.getView().findViewById(R.id.temp_tag);
voltage_tag=(TextView)this.getView().findViewById(R.id.voltage_tag);
heath_tag.setTypeface(secondrayTypeFace);
tech_tag.setTypeface(secondrayTypeFace);
temp_tag.setTypeface(secondrayTypeFace);
voltage_tag.setTypeface(secondrayTypeFace);
/** Code for Google Admob */
bLevel.setTypeface(myTypeface);
header.setTypeface(myTypeface);
// register the Broadcast Receiver
this.getActivity ().registerReceiver(this.batteryInfoReceiver, new IntentFilter(
Intent.ACTION_BATTERY_CHANGED));
// Setting up the Intent for the Power Usage details
usageIntent = new Intent(Intent.ACTION_POWER_USAGE_SUMMARY);
// Check it for presence
resolveInfo = getActivity ().getPackageManager().resolveActivity(usageIntent, 0);
if (resolveInfo == null) {
//Toast.makeText.(this, "Not Support!", Toast.LENGTH_LONG).show();
cheakUsage.setEnabled(false);
} else {
cheakUsage.setEnabled(true);
}
// Setting up the functionality of the Button Clicks
cheakUsage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(usageIntent);
}
});
return root;
}
private BroadcastReceiver batteryInfoReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
setUpStats(intent);
// Toast.makeText(getBaseContext(),
// ""+intent.getIntExtra(BatteryManager.EXTRA_TEMPERATURE,-1),Toast.LENGTH_SHORT).show();
new ShowProgressClass().execute();
}
};
public void setUpStats(Intent intent) {
GetBatteryStats stats = new GetBatteryStats(intent);
health.setText("" + stats.getBatteryHealth());
tech.setText("" + stats.getBatteryTechnology());
temp.setText("" + stats.getBatteryTempreture());
voltage.setText("" + stats.getBatteryVoltage());
//Setting up typefaces for the stats
health.setTypeface(secondrayTypeFace);
tech.setTypeface(secondrayTypeFace);
temp.setTypeface(secondrayTypeFace);
voltage.setTypeface(secondrayTypeFace);
/**Save current voltage and level to calculate the Remaining time on Battery*/
SharedPreferences prefs=this.getActivity().getSharedPreferences(LEVEL, Context.MODE_PRIVATE);
prefs.edit().putString("level",""+level);
prefs.edit().putString("voltage",stats.getBatteryVoltage());
}
// For Upadating progress bar After loading
class ShowProgressClass extends AsyncTask<Void, Integer, Void> {
@Override
protected Void doInBackground(Void... params) {
for (int i = 0; i < level; i++) {
publishProgress(1);
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// TODO Auto-generated method stub
return null;
}
@Override
protected void onPreExecute() {
bProgress.setMax(100);
bProgress.setProgress(0);
// TODO Auto-generated method stub
}
@Override
protected void onProgressUpdate(Integer... values) {
bProgress.incrementProgressBy(values[0]);
bLevel.setText(" " + bProgress.getProgress() + "%");
// TODO Auto-generated method stub
}
}
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
}
}
但是当我尝试运行它时，我得到以下错误：
04-04 15:27:26.299: W/dalvikvm(9929): threadid=1: thread exiting with uncaught exception (group=0x40f259a8)
04-04 15:27:26.299: E/test(9929): Exception
04-04 15:27:26.310: E/AndroidRuntime(9929): FATAL EXCEPTION: main
04-04 15:27:26.310: E/AndroidRuntime(9929): java.lang.NullPointerException
04-04 15:27:26.310: E/AndroidRuntime(9929): at com.raihanbd.easyrambooster.BatteryCheck.onCreateView(BatteryCheck.java:76)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.View.measure(View.java:15698)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4918)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.View.measure(View.java:15698)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.widget.LinearLayout.measureVertical(LinearLayout.java:850)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.View.measure(View.java:15698)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4918)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
04-04 15:27:26.310: E/AndroidRuntime(9929): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2197)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.View.measure(View.java:15698)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2171)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1255)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1449)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1145)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4907)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.Choreographer.doCallbacks(Choreographer.java:579)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.Choreographer.doFrame(Choreographer.java:548)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.os.Handler.handleCallback(Handler.java:725)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.os.Handler.dispatchMessage(Handler.java:92)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.os.Looper.loop(Looper.java:153)
04-04 15:27:26.310: E/AndroidRuntime(9929): at android.app.ActivityThread.main(ActivityThread.java:5299)
04-04 15:27:26.310: E/AndroidRuntime(9929): at java.lang.reflect.Method.invokeNative(Native Method)
04-04 15:27:26.310: E/AndroidRuntime(9929): at java.lang.reflect.Method.invoke(Method.java:511)
04-04 15:27:26.310: E/AndroidRuntime(9929): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
04-04 15:27:26.310: E/AndroidRuntime(9929): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
04-04 15:27:26.310: E/AndroidRuntime(9929): at dalvik.system.NativeStart.main(Native Method)
这个活动是关于我刚刚找到的手机电池信息... 我要编辑它，但首先我需要它作为片段。
【问题讨论】：
-
您的错误信息。说在第 76 行有一个空指针 - 你的“getView() 方法是错误的。用“root”替换它，因为这是你的基本视图
标签： android android-activity fragment