Java 致命异常：主（无法转换为维度）
我对android和java编程都很陌生。我无法运行我的第一个应用程序，因为它说不幸的是，该应用程序已停止。在logcat中，我可以看到致命的异常：main。你能指出我犯的新手错误吗。我的java代码如下：Java 致命异常：主（无法转换为维度）,java,android,xml,Java,Android,Xml,我对android和java编程都很陌生。我无法运行我的第一个应用程序，因为它说不幸的是，该应用程序已停止。在logcat中，我可以看到致命的异常：main。你能指出我犯的新手错误吗。我的java代码如下： package com.example.calculator; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.os.B
package com.example.calculator;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
int counter;
Button add, sub;
TextView out;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
if (toolbar != null) {
toolbar.setTitle(R.string.app_name);
setSupportActionBar(toolbar);
}
counter = 0;
add = (Button) findViewById(R.id.button1);
sub = (Button) findViewById(R.id.button2);
out = (TextView) findViewById(R.id.textView3);
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter++;
out.setText("Current value is "+counter);
}
});
sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter--;
out.setText("Current value is "+counter);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/toolbar"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:popupTheme="@style/Theme.AppCompat"
xmlns:tools="http://schemas.android.com/tools"
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"
tools:context="com.example.calculator.MainActivity">
<Button
android:id="@+id/button2"
android:layout_width="120dp"
android:layout_height="70dp"
android:layout_alignEnd="@+id/textView2"
android:layout_alignRight="@+id/textView2"
android:layout_alignLeft="@+id/button1"
android:layout_alignStart="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginEnd="@+id/textView2"
android:layout_marginRight="@+id/textView2"
android:text="@string/sub"
android:textSize="20sp" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/button2"
android:layout_alignRight="@+id/button2"
android:layout_alignLeft="@+id/button2"
android:layout_alignStart="@+id/button1"
android:layout_below="@+id/button2"
android:gravity="center"
android:layout_marginTop="17dp"
android:text="@string/out"
android:textSize="20sp" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="56dp"
android:text="@string/hello_world"
android:textSize="30sp" />
<Button
android:id="@+id/button1"
android:layout_width="120dp"
android:layout_height="70dp"
android:layout_alignLeft="@+id/textView2"
android:layout_alignRight="@+id/textView2"
android:layout_alignStart="@+id/textView2"
android:layout_alignEnd="@+id/textView2"
android:layout_below="@+id/textView2"
android:layout_marginTop="32dp"
android:text="@string/add"
android:textSize="20sp" />
</android.support.v7.widget.Toolbar>
package com.example.calculator;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
int counter;
Button add, sub;
TextView out;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
if (toolbar != null) {
toolbar.setTitle(R.string.app_name);
setSupportActionBar(toolbar);
}
counter = 0;
add = (Button) findViewById(R.id.button1);
sub = (Button) findViewById(R.id.button2);
out = (TextView) findViewById(R.id.textView3);
add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter++;
out.setText("Current value is "+counter);
}
});
sub.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter--;
out.setText("Current value is "+counter);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/toolbar"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:popupTheme="@style/Theme.AppCompat"
xmlns:tools="http://schemas.android.com/tools"
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"
tools:context="com.example.calculator.MainActivity">
<Button
android:id="@+id/button2"
android:layout_width="120dp"
android:layout_height="70dp"
android:layout_alignEnd="@+id/textView2"
android:layout_alignRight="@+id/textView2"
android:layout_alignLeft="@+id/button1"
android:layout_alignStart="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginEnd="@+id/textView2"
android:layout_marginRight="@+id/textView2"
android:text="@string/sub"
android:textSize="20sp" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/button2"
android:layout_alignRight="@+id/button2"
android:layout_alignLeft="@+id/button2"
android:layout_alignStart="@+id/button1"
android:layout_below="@+id/button2"
android:gravity="center"
android:layout_marginTop="17dp"
android:text="@string/out"
android:textSize="20sp" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="56dp"
android:text="@string/hello_world"
android:textSize="30sp" />
<Button
android:id="@+id/button1"
android:layout_width="120dp"
android:layout_height="70dp"
android:layout_alignLeft="@+id/textView2"
android:layout_alignRight="@+id/textView2"
android:layout_alignStart="@+id/textView2"
android:layout_alignEnd="@+id/textView2"
android:layout_below="@+id/textView2"
android:layout_marginTop="32dp"
android:text="@string/add"
android:textSize="20sp" />
</android.support.v7.widget.Toolbar>
08-29 05:34:14.800: E/AndroidRuntime(770): FATAL EXCEPTION: main
08-29 05:34:14.800: E/AndroidRuntime(770): Process: com.example.calculator, PID: 770
08-29 05:34:14.800: E/AndroidRuntime(770): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.calculator/com.example.calculator.MainActivity}: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x12
08-29 05:34:14.800: E/AndroidRuntime(770): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2197)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2258)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.app.ActivityThread.access$800(ActivityThread.java:138)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1209)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.os.Handler.dispatchMessage(Handler.java:102)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.os.Looper.loop(Looper.java:136)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.app.ActivityThread.main(ActivityThread.java:5026)
08-29 05:34:14.800: E/AndroidRuntime(770): at java.lang.reflect.Method.invokeNative(Native Method)
08-29 05:34:14.800: E/AndroidRuntime(770): at java.lang.reflect.Method.invoke(Method.java:515)
08-29 05:34:14.800: E/AndroidRuntime(770): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
08-29 05:34:14.800: E/AndroidRuntime(770): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
08-29 05:34:14.800: E/AndroidRuntime(770): at dalvik.system.NativeStart.main(Native Method)
08-29 05:34:14.800: E/AndroidRuntime(770): Caused by: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x12
08-29 05:34:14.800: E/AndroidRuntime(770): at android.content.res.TypedArray.getDimensionPixelSize(TypedArray.java:464)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:6134)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.support.v7.app.ActionBar$LayoutParams.<init>(ActionBar.java:1327)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.support.v7.widget.Toolbar$LayoutParams.<init>(Toolbar.java:1801)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.support.v7.widget.Toolbar.generateLayoutParams(Toolbar.java:1694)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.support.v7.widget.Toolbar.generateLayoutParams(Toolbar.java:107)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.view.LayoutInflater.rInflate(LayoutInflater.java:757)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:249)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:106)
08-29 05:34:14.800: E/AndroidRuntime(770): at com.example.calculator.MainActivity.onCreate(MainActivity.java:23)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.app.Activity.performCreate(Activity.java:5242)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-29 05:34:14.800: E/AndroidRuntime(770): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161)
08-29 05:34:14.800: E/AndroidRuntime(770): ... 11 more
布局使用了不可用的主题属性。这些属性仅在API级别21及更高版本中可用 我猜您在清单或gradle构建配置中将minSdkVersion设置为低于21 要与较低的API级别保持兼容，请将工具栏视图中的属性更改为：
android:background="@color/PrimaryColor"
android:minHeight="?android:attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
您需要更改并添加logcatplease@Jens我现在已经添加了。坠机线的代码段是什么？@JoxTraex没有理解你。我怎样才能找到它？@Manas您能确保在values res文件夹中的xml中声明了所有@dimen值吗？