[英]New to Android: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo
[英]java.lang.RuntimeException: Unable to instantiate activity ComponentInfo in Android Studio
我是 Android Studio 的初學者。 我正在嘗試在我的手機上運行我的應用程序,但是當我嘗試在我的手機上運行我的應用程序時它顯示
不幸的是應用程序已停止
這是 Logcat android 監視器中顯示的錯誤。
10-23 23:19:25.882 18014-18014/com.example.dhara.codesprint E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.dhara.codesprint, PID: 18014
java.lang.RuntimeException: Unable to start activity ComponentInfo
{com.example.dhara.codesprint/com.example.dhara.codesprint.MainActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2299)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1243)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5372)
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:970)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:786)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
at android.support.v7.app.AppCompatDelegateImplV7.setSupportActionBar(AppCompatDelegateImplV7.java:198)
at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:130)
at com.example.dhara.codesprint.MainActivity.onCreate(MainActivity.java:39)
at android.app.Activity.performCreate(Activity.java:5258)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1099)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2239)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1243)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5372)
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:970)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:786)
at dalvik.system.NativeStart.main(Native Method)
下面是 MainActivity.java 的代碼
package com.example.dhara.codesprint;
import android.content.res.AssetManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
TextView text1;
TextView text2;
TextView text3;
TextView text4;
TextView text5;
TextView text6;
EditText text7;
Button checkAnswer;
Button reset;
//private WordDictionary dictionary;
private String currentWord;
private ArrayList<String> words;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
AssetManager assetManager = getAssets();
try {
InputStream inputStream = assetManager.open("words.txt");
} catch (IOException e) {
Toast toast = Toast.makeText(this, "Could not load dictionary", Toast.LENGTH_LONG);
toast.show();
}
text1 = (TextView) findViewById(R.id.textView1);
text2 = (TextView) findViewById(R.id.textView2);
text3 = (TextView) findViewById(R.id.textView3);
text4 = (TextView) findViewById(R.id.textView4);
text5 = (TextView) findViewById(R.id.textView5);
text6 = (TextView) findViewById(R.id.textView6);
text7 = (EditText) findViewById(R.id.edittext);
checkAnswer = (Button) findViewById(R.id.button);
reset = (Button) findViewById(R.id.button2);
reset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
checkAnswer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
}
}
AndroidMainfest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.dhara.codesprint">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="Codesprint"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
活動_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@color/background"
tools:context=".MainActivity">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/circle"
android:layout_marginLeft="13dp"
android:layout_marginStart="13dp"
android:layout_marginTop="14dp"
android:id="@+id/imageView1"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/circle"
android:id="@+id/imageView2"
android:layout_alignTop="@+id/imageView3"
android:layout_alignLeft="@+id/imageView5"
android:layout_alignStart="@+id/imageView5" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/circle"
android:id="@+id/imageView3"
android:layout_alignTop="@+id/imageView1"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="24dp"
android:layout_marginEnd="24dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/circle"
android:layout_marginTop="27dp"
android:id="@+id/imageView4"
android:layout_below="@+id/imageView1"
android:layout_alignLeft="@+id/imageView1"
android:layout_alignStart="@+id/imageView1" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/circle"
android:id="@+id/imageView5"
android:layout_alignTop="@+id/imageView4"
android:layout_centerHorizontal="true" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/circle"
android:id="@+id/imageView6"
android:layout_alignTop="@+id/imageView5"
android:layout_alignLeft="@+id/imageView3"
android:layout_alignStart="@+id/imageView3" />
<EditText
android:text="Your Answer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/imageView5"
android:layout_centerHorizontal="true"
android:layout_marginTop="55dp"
android:id="@+id/edittext"
android:textSize="20sp"
android:textAlignment="center"
android:textStyle="normal|bold"
android:textColorLink="?attr/actionMenuTextColor" />
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="31dp"
android:id="@+id/textView2"
android:textAlignment="center"
android:textStyle="normal|bold"
android:layout_alignTop="@+id/imageView2"
android:layout_alignLeft="@+id/imageView2"
android:layout_alignStart="@+id/imageView2"
android:layout_alignRight="@+id/imageView2"
android:layout_alignEnd="@+id/imageView2"
android:textColor="@android:color/background_light" />
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView2"
android:layout_alignRight="@+id/imageView3"
android:layout_alignEnd="@+id/imageView3"
android:id="@+id/textView3"
android:layout_alignLeft="@+id/imageView3"
android:layout_alignStart="@+id/imageView3"
android:textAlignment="center"
android:textStyle="normal|bold"
android:textColor="@android:color/background_light" />
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/imageView4"
android:layout_alignRight="@+id/imageView4"
android:layout_alignEnd="@+id/imageView4"
android:layout_marginTop="30dp"
android:id="@+id/textView4"
android:layout_alignLeft="@+id/imageView4"
android:layout_alignStart="@+id/imageView4"
android:textAlignment="center"
android:textStyle="normal|bold"
android:textColor="@android:color/background_light" />
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/textView4"
android:layout_alignRight="@+id/imageView5"
android:layout_alignEnd="@+id/imageView5"
android:id="@+id/textView5"
android:layout_alignLeft="@+id/imageView5"
android:layout_alignStart="@+id/imageView5"
android:textAlignment="center"
android:textStyle="normal|bold"
android:textColor="@android:color/background_light" />
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView5"
android:layout_alignRight="@+id/imageView6"
android:layout_alignEnd="@+id/imageView6"
android:id="@+id/textView6"
android:layout_alignLeft="@+id/imageView6"
android:layout_alignStart="@+id/imageView6"
android:textAlignment="center"
android:textStyle="normal|bold"
android:textColor="@android:color/background_light" />
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView2"
android:layout_alignRight="@+id/imageView1"
android:layout_alignEnd="@+id/imageView1"
android:id="@+id/textView1"
android:layout_alignLeft="@+id/imageView1"
android:layout_alignStart="@+id/imageView1"
android:textAlignment="center"
android:textStyle="normal|bold"
android:textColor="@android:color/background_light" />
<Button
android:text="Check Your Answer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="25dp"
android:id="@+id/button"
android:textAlignment="center"
android:textStyle="normal|bold"
android:textColor="@android:color/background_light"
android:background="@color/colorPrimary"
android:layout_below="@+id/edittext"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:text="Reset"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="27dp"
android:id="@+id/button2"
android:background="@color/colorPrimary"
android:textSize="14sp"
tools:textColor="@android:color/background_light" />
</RelativeLayout>
我已經嘗試了一些來自網絡的解決方案,但它不起作用。
您的布局沒有Toolbar
,但您正在調用以下內容:
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
刪除這些調用或將Toolbar
添加到您的布局。
對於后者,您還需要使用(或派生自)沒有ActionBar
的 AppCompat 主題Theme.AppCompat.Light.NoActionBar
,例如Theme.AppCompat.Light.NoActionBar
。
所以在你的styles.xml你會有這樣的東西:
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
</style>
在設置布局 xml 之前,您無法啟動您的視圖元素(TextView、Buttons 等),對於您的情況,它是R.layout.activity_main
文件。
package com.example.dhara.codesprint;
import android.content.res.AssetManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
//private WordDictionary dictionary;
private String currentWord;
private ArrayList<String> words;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView text1 = (TextView) findViewById(R.id.textView1);
TextView text2 = (TextView) findViewById(R.id.textView2);
TextView text3 = (TextView) findViewById(R.id.textView3);
TextView text4 = (TextView) findViewById(R.id.textView4);
TextView text5 = (TextView) findViewById(R.id.textView5);
TextView text6 = (TextView) findViewById(R.id.textView6);
TextView text7 = (TextView) findViewById(R.id.edittext);
Button checkAnswer = (Button) findViewById(R.id.button);
Button reset = (Button) findViewById(R.id.button2);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
AssetManager assetManager = getAssets();
try {
InputStream inputStream = assetManager.open("words.txt");
} catch (IOException e) {
Toast toast = Toast.makeText(this, "Could not load dictionary", Toast.LENGTH_LONG);
toast.show();
}
reset.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
checkAnswer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
}
}
請在 onCreate() 中初始化您的布局元素,因為當您的活動開始時它會調用 onCreate() 方法,但在這里您是從您的 onCreate() 方法調用您的布局,但之后您沒有初始化您的元素,還要檢查您是否是否在您的清單中添加了活動名稱,請仔細閱讀並實施,希望對您有所幫助。
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