AndroidRuntime关闭致命异常：主Android Studio 2.2
在应用上工作，只有在手机上运行时遇到问题。
这是运行信息：
09/24 21:02:00: Launching app
Cold swapped changes.
$ adb shell am start -n "com.example.crow.page3/com.example.crow.page3.Page3main" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Client not ready yet..Connected to process 1154 on device oneplus-a0001-793b4d36
I/art: Late-enabling -Xcheck:jni
W/System: ClassLoader referenced unknown path: /data/app/com.example.crow.page3-2/lib/arm
I/InstantRun: Instant Run Runtime started. Android package is com.example.crow.page3, real application class is null.
W/System: ClassLoader referenced unknown path: /data/app/com.example.crow.page3-2/lib/arm
I/LoadedApk: No resource references to update in package common
I/LoadedApk: No resource references to update in package com.blinq.theme.CleanUI.blue
I/LoadedApk: No resource references to update in package com.blinq.theme.CleanUI.blue
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.crow.page3, PID: 1154
Theme: themes:{default=overlay:com.blinq.theme.CleanUI.blue, iconPack:com.blinq.theme.CleanUI.blue, fontPkg:com.blinq.theme.CleanUI.blue, com.android.systemui=overlay:com.blinq.theme.CleanUI.blue, com.android.systemui.navbar=overlay:com.blinq.theme.CleanUI.blue}
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.crow.page3/com.example.crow.page3.Page3main}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TabHost.setup()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2450)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2510)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TabHost.setup()' on a null object reference
at com.example.crow.page3.Page3main.onCreate(Page3main.java:54)
at android.app.Activity.performCreate(Activity.java:6251)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2403)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2510)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
I/Process: Sending signal. PID: 1154 SIG: 9
Application terminated.
我已经尝试了好几件事并多次使用代码。下面是com.example.crow.page3.Page3main：
的代码import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.Button;
import android.widget.TabHost;
import android.app.Activity;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.appindexing.Thing;
import com.google.android.gms.common.api.GoogleApiClient;
public class Page3main extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
EditText nameTxt, phoneTxt, emailTxt, addressTxt;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//add new contact:--------------------------------------------------
setContentView(R.layout.activity_page3main);
nameTxt = (EditText) findViewById(R.id.txtName);
phoneTxt = (EditText) findViewById(R.id.txtPhone);
emailTxt = (EditText) findViewById(R.id.txtEmail);
addressTxt = (EditText) findViewById(R.id.txtAddress);
//define tabs for from add contact tabs
TabHost tabHost = (TabHost) findViewById(R.id.tabHost);
tabHost.setup();
TabHost.TabSpec tabSpec = tabHost.newTabSpec("creator");
tabSpec.setContent(R.id.tabAddContact);
tabSpec.setIndicator("Creator");
tabHost.addTab(tabSpec);
tabSpec = tabHost.newTabSpec("list");
tabSpec.setContent(R.id.tabContactList);
tabSpec.setIndicator("List");
tabHost.addTab(tabSpec);
final Button addBtn = (Button) findViewById(R.id.btnAdd);
//What happens on :
nameTxt.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int i, int i2, int i3) {
}
@Override
public void onTextChanged(CharSequence s, int i, int i2, int i3) {
//check if there was input in the text
addBtn.setEnabled(!nameTxt.getText().toString().trim().isEmpty());
}
@Override
public void afterTextChanged(Editable editable) {
}
});
//-------------------------------------------------------------------
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.page3main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
FragmentManager fragmentManager = getFragmentManager();
if (id == R.id.nav_logbook) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame, new FirstFragmentLogbook()).commit();
} else if (id == R.id.nav_contacts) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame, new SecondFragmentContacts()).commit();
} else if (id == R.id.nav_map) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame, new ThirdFragmentMap()).commit();
} else if (id == R.id.nav_site_info) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
public Action getIndexApiAction() {
Thing object = new Thing.Builder()
.setName("Page3main Page") // TODO: Define a title for the content shown.
// TODO: Make sure this auto-generated URL is correct.
.setUrl(Uri.parse("http://[ENTER-YOUR-URL-HERE]"))
.build();
return new Action.Builder(Action.TYPE_VIEW)
.setObject(object)
.setActionStatus(Action.STATUS_TYPE_COMPLETED)
.build();
}
@Override
public void onStart() {
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client.connect();
AppIndex.AppIndexApi.start(client, getIndexApiAction());
}
@Override
public void onStop() {
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
AppIndex.AppIndexApi.end(client, getIndexApiAction());
client.disconnect();
}
}
任何想法都将不胜感激。感谢
布局代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
tools:context=".Page3main"
android:orientation="vertical"
android:baselineAligned="false"
android:weightSum="1">
<TabHost
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/tabHost"
android:layout_gravity="left|center_vertical">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</TabWidget>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:id="@+id/tabContactList"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:text="TextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/textView3"
android:textAppearance="@android:style/TextAppearance.Material.Large"
android:layout_margin="10dp"
android:layout_gravity="center"
android:textAlignment="center" />
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
<LinearLayout
android:id="@+id/tabAddContact"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lblCreatorTitle"
android:layout_gravity="center"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="New Contact"
android:layout_margin="10dp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:id="@+id/txtName"
android:hint="Name"
android:inputType="textPersonName"
android:layout_gravity="center"
android:layout_weight="0.10"
android:drawableStart="@drawable/ic_contacts_black_24dp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="phone"
android:ems="10"
android:id="@+id/txtPhone"
android:hint="Phone"
android:layout_gravity="center"
android:layout_weight="0.10"
android:drawableStart="@drawable/ic_call_black_24dp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:ems="10"
android:id="@+id/txtEmail"
android:hint="Email"
android:layout_gravity="center"
android:layout_weight="0.10"
android:drawableStart="@drawable/ic_email_black_24dp" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPostalAddress"
android:ems="10"
android:id="@+id/txtAddress"
android:hint="Address"
android:layout_gravity="center"
android:layout_weight="0.10"
android:drawableStart="@drawable/ic_place_black_24dp" />
<Button
android:text="Add"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnAdd"
android:textAlignment="center"
android:layout_gravity="center" />
</LinearLayout>
</FrameLayout>
</LinearLayout>
</TabHost>
</LinearLayout>
1 个答案:
答案 0 :(得分：0)
根据您的日志，您在android.widget.TabHost.setup()
问题可能在以下代码行中
//define tabs for from add contact tabs
TabHost tabHost = (TabHost) findViewById(R.id.tabHost);
tabHost.setup();
在上面的代码中，R.id.tabHost返回一个空指针。请检查您的布局中是否已定义此ID。此外，如果您发布此ID的代码，我可以进一步帮助您。
修改
好的问题是你在使用findViewById加载了标签后调用了setup方法。在通过findViewByid加载制表符之前，必须调用setup方法。
请参阅开发人员文档的下方屏幕截图。
以下是文档页面的link。我希望这会有所帮助。
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