在我的Android应用程序列表视图中有一个图像。 imageview在另一个布局上。我想通过代码将该图像更改为另一个图像。当我用代码运行程序时出现错误..'
任何人都可以帮我找到错误谢谢你./
我试过..
Bitmap bImag = BitmapFactory.decodeResource(this.getResources(), R.drawable.tick);
down.setImageBitmap(bImag);
,这也是
myImgView.setBackgroundResource(R.drawable.monkey);
我的xml代码..(我在imageview上使用了Onclick)
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/Itemname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:layout_gravity="center"
android:text="asdas"
android:layout_weight="0.9"
android:paddingTop="5dp"/>
<ImageView
android:id="@+id/icon"
android:onClick="download"
android:layout_width="50dp"
android:layout_height="50dp"
android:gravity="right"
android:layout_gravity="center"
android:layout_marginBottom="5dp"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_marginTop="5dp"
android:src="@drawable/download" />
</LinearLayout>
Java代码..
public void download(View view) {
String value = getIntent().getExtras().getString("id");
if (value.equals("Pretham (2016)")) {
Intent i=new Intent(Song_List.this, MyService.class);
startService(i);
Toast.makeText(Song_List.this, "Downloading..........", Toast.LENGTH_SHORT).show();
Bitmap bImag = BitmapFactory.decodeResource(this.getResources(), R.drawable.tick);
down.setImageBitmap(bImag);
}else{
Toast.makeText(Song_List.this, "Downloaded Song.....", Toast.LENGTH_SHORT).show();
}
我的logcat是..
Process: com.example.jithin.myapplication, PID: 1539
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5201)
at android.view.View$PerformClick.run(View.java:21163)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
答案 0 :(得分:0)
imageView有:
android:onClick="download"
仅当布局来自Activity setContentView()而不是listview或Fragment
时才有效您需要添加适配器:
ImageView img = findViewById(R.id.download);
img.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//CODE on click
}
});
并从xml中删除onclick