Question

更新：所以我忘了澄清这一点，但是按钮首先在App UNTIL动态添加时不存在。一旦布局用按钮充气，按钮就会导致崩溃。我为这一发展带来的问题道歉。

因此，无论如何都有一个按钮不断崩溃我的程序（除非我删除了onClick）。我测试了我的Java代码中的每一行，看看是什么导致了它，但即使把它留空，它仍然会崩溃。

从我的MainActivity.Java中，导致崩溃的方法：

public void changeState(View v) {
    String owe = "O";
    String debt = "D";

    button = (Button) findViewById(R.id.decl);

    if (button.getText().toString().equals("D")) {
        button.setText("O");
    } else {
        button.setText(("D"));
    }
}

同样来自Java文件的布局膨胀方法，它创建导致崩溃的按钮：

public void create(MenuItem v) {
    newContact = new LinearLayout(this);
    newContact.setOrientation(LinearLayout.HORIZONTAL);


    LayoutInflater vi = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = vi.inflate(R.layout.newcontact, null);

    view.setOnTouchListener(new OnSwipeTouchListener(this) {
        public void onSwipeRight() {
        }
    });

    // insert into main view
    ViewGroup insertPoint = (ViewGroup) findViewById(R.id.insert);
    insertPoint.addView(view);
}

上面的Java代码会膨胀这个xml文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#CCFFFF"
android:weightSum="1">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="81dp"
    android:orientation="horizontal">

    <EditText
        android:id="@+id/name"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginLeft="12dp"
        android:layout_weight="2"
        android:ems="10"
        android:hint="Name"
        android:inputType="textPersonName"
        android:padding="14dp"
        android:shadowColor="#0066FF"
        android:textColor="#000000"
        android:textColorHint="#8F8F8F" />

    <Button
        android:id="@+id/decl"
        android:layout_width="0dp"
        android:layout_weight=".75"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="10dp"
        android:text="D"
        android:textColor="#FFFFFF"
        android:textSize="20dp"/>


    <!--android:onClick="changeState"-->

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="2"
        android:orientation="vertical">\

        <EditText
            android:id="@+id/amount"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="(Ex 123.25)"
            android:inputType="numberDecimal"
            android:shadowColor="#0066FF"
            android:textColor="#000000"
            android:textColorHint="#8F8F8F"
            android:textSize="16dp" />

        <EditText
            android:id="@+id/owed"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="(Ex $, coffee)"
            android:shadowColor="#0066FF"
            android:textColor="#000000"
            android:textColorHint="#8F8F8F"
            android:textSize="16dp" />

    </LinearLayout>

</LinearLayout>

<LinearLayout
    android:id="@+id/textView"
    android:layout_width="fill_parent"
    android:layout_height="3dp"
    android:orientation="vertical"
    android:background="#CFCFCF"
    />

按钮：

<Button
    android:id="@+id/decl"
    android:layout_width="0dp"
    android:layout_weight=".75"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_margin="10dp"
    android:text="D"
    android:textColor="#FFFFFF"
    android:textSize="20dp"
    android:onClick="changeState"
/>

崩溃日志

08-09 22:44:22.792    1951-1951/com.xephos.detra E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.xephos.detra, PID: 1951
java.lang.IllegalStateException: Could not find a method changeState(View) in the activity class android.app.Application for onClick handler on view class android.widget.Button with id 'decl'
        at android.view.View$1.onClick(View.java:4007)
        at android.view.View.performClick(View.java:4780)
        at android.view.View$PerformClick.run(View.java:19866)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5257)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at ...

Answer 1

修改在setContentView（）之后将它放在MainActivity中：

public void create(MenuItem v) { newContact = new LinearLayout(this); newContact.setOrientation(LinearLayout.HORIZONTAL); LayoutInflater vi = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); View view = vi.inflate(R.layout.newcontact, null); Button b = (Button)view.findViewById(R.id.decl); if (b != null) { b.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Button b = (Button)v; if ("D".equals(b.getText().toString())) { b.setText("O"); } else { b.setText(("D")); } } }); } view.setOnTouchListener(new OnSwipeTouchListener(this) { public void onSwipeRight() { } }); // insert into main view ViewGroup insertPoint = (ViewGroup) findViewById(R.id.insert); insertPoint.addView(view); }

Java，XML - onClick崩溃了我的程序

1 个答案: