Question

我是Android新手。我想点击EditText

使ImageView可见

public void clickHandler(View v) {
    if (v.getId() == R.id.orderQty){
        System.out.println(" edit text click");
        System.out.println(" edit text id    dilshad : "+v.getId());
        int id = v.getId();
        id = R.id.save_on_id;
        System.out.println("save button id on button click     : "+id);
        int rew = id;
        v.setId(id);
        System.out.println("save button set  and get id      : "+ v.getId());
        ImageView imageView = (ImageView)v; 
        imageView.setImageResource(R.drawable.save_on);
        imageView.setVisibility(ImageView.VISIBLE);
    }
}

这是我的Edittext

的xml

<EditText
    android:id="@+id/orderQty"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:focusable="true"
    android:focusableInTouchMode="false"
    android:onClick="clickHandler" >
</EditText>

和这个ImageView在同一个xml中

<ImageView
    android:id="@+id/save_on_id"
    android:layout_width="50dp"
    android:layout_height="match_parent"
    android:layout_alignParentRight="true"
    android:layout_below="@+id/separator_bottom"
    android:background="#fff"
    android:clickable="true"
    android:visibility="gone"
    android:onClick="clickHandler"
    android:src="@drawable/save_on" />

但我得到了例外，

02-05 16:01:51.969: W/dalvikvm(10554): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
02-05 16:01:51.989: E/AndroidRuntime(10554): FATAL EXCEPTION: main
02-05 16:01:51.989: E/AndroidRuntime(10554): java.lang.IllegalStateException: Could not execute method of the activity
02-05 16:01:51.989: E/AndroidRuntime(10554):    at android.view.View$1.onClick(View.java:2072)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at android.view.View.performClick(View.java:2408)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at android.view.View$PerformClick.run(View.java:8816)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at android.os.Handler.handleCallback(Handler.java:587)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at android.os.Handler.dispatchMessage(Handler.java:92)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at android.os.Looper.loop(Looper.java:123)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at android.app.ActivityThread.main(ActivityThread.java:4627)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at java.lang.reflect.Method.invokeNative(Native Method)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at java.lang.reflect.Method.invoke(Method.java:521)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at dalvik.system.NativeStart.main(Native Method)
02-05 16:01:51.989: E/AndroidRuntime(10554): Caused by: java.lang.reflect.InvocationTargetException
02-05 16:01:51.989: E/AndroidRuntime(10554):    at com.example.demoekot.MainScreen.clickHandler(MainScreen.java:491)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at java.lang.reflect.Method.invokeNative(Native Method)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at java.lang.reflect.Method.invoke(Method.java:521)
02-05 16:01:51.989: E/AndroidRuntime(10554):    at android.view.View$1.onClick(View.java:2067)
02-05 16:01:51.989: E/AndroidRuntime(10554):    ... 11 more
02-05 16:01:51.989: E/AndroidRuntime(10554): Caused by: java.lang.ClassCastException: android.widget.EditText
02-05 16:01:51.989: E/AndroidRuntime(10554):    ... 15 more
02-05 16:01:55.189: I/Process(10554): Sending signal. PID: 10554 SIG: 9

有什么问题请帮我解决问题。在此先感谢所有人。

Answer 1

您正试图将EditText强制转换为ImageView。

试试这个......

    ImageView imageView = (ImageView) findViewById(R.id.save_on_id);
    imageView.setImageResource(R.drawable.save_on);
    imageView.setVisibility(ImageView.VISIBLE);

并且不要尝试更改View的ID。（您要将EditText的ID分配给ImageView）

修改了代码版本...试试这个

public void clickHandler(View v) {
    if (v.getId() == R.id.orderQty) {
        ImageView imageView = (ImageView) findViewById(R.id.save_on_id);
        imageView.setImageResource(R.drawable.save_on);
        imageView.setVisibility(ImageView.VISIBLE);
    }
}

Answer 2

非常复杂的代码。

if (v.getId() == R.id.orderQty) { // v is an instance of EditText
    int id = v.getId(); // Useless initialisation
    id = R.id.save_on_id;
    int rew = id; // Useless
    v.setId(id); // v is still an instance of EditText
    ImageView imageView = (ImageView)v; // java.lang.ClassCastException: android.widget.EditText
    //...
}

您最好使用findViewById方法

Answer 3

试试这个..

public void clickHandler(View v) {
    if (v.getId() == R.id.orderQty) {
        System.out.println(" edit text click");
        System.out.println(" edit text id    dilshad : " + v.getId());
        int id = v.getId();
        id = R.id.save_on_id;
        System.out.println("save button id on button click     : " + id);
        int rew = id;
        v.setId(id);
        System.out.println("save button set  and get id      : "
        + v.getId());
        //hide edit text
        v.setVisibility(View.GONE);

        //show your image view
        ImageView iv = (ImageView) findViewById(R.id.save_on_id);
        iv.setImageResource(R.drawable.save_on);
        iv.setVisibility(View.VISIBLE);
    }
}

Answer 4

使用 View.VISIBLE

而不是

ImageView.VISIBLE

另外

如何点击view <{1}}

那里存在一些逻辑问题。您点按的视图不是invisible和ImageView。所以在那个

中

EditText

如何在ClickText中创建可见的ImageView

4 个答案: