Java 如何在android中更改ImageView源
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How to change ImageView source in android
提问by CENT1PEDE
This is my xml, this is located inside a fragment that appears in my activity.
这是我的 xml，它位于出现在我的活动中的片段内。
<FrameLayout
android:id="@+id/frame1"
android:layout_width="wrap_content"
android:layout_height="115dp"
android:layout_margin="2dp"
android:layout_weight="0.33">
<ImageView
android:id="@+id/whoamiwith"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitCenter"
android:src="@drawable/default_image" />
</FrameLayout>
And this is my java code :
这是我的 Java 代码：
@Override
public void onClick(View click) {
if (click == profileBtn) {
whoamiwith.setBackgroundResource(R.drawable.image_i_wanna_put);
}
}
I am trying to change the image source of the image view. There are no syntax errors but when I click the button the emulator is giving me a force close and on the logcat it says:
我正在尝试更改图像视图的图像源。没有语法错误，但是当我单击按钮时，模拟器给我强制关闭，并且在 logcat 上它说：
java.lang.NullPointerException
java.lang.NullPointerException
It's pointing to the line:
它指向这条线：
whoamiwith.setBackgroundResource(R.drawable.loginbtn);
采纳答案by Bhanu Sharma
whoamiwith.setImageResource(R.drawable.loginbtn);
回答by SweetWisher ツ
Initialize image view :
初始化图像视图：
whoamiwith = findViewByid(R.id.whoamiwith);
Then on Click method, write this lines to change the image resource :
然后在 Click 方法上，编写以下行来更改图像资源：
if(android.os.Build.VERSION.SDK_INT > 15)
{
// for API above 15
whoamiwith.setBackground(getResources().getDrawable(R.drawable.loginbtn));
}
else
{
// for API below 15
whoamiwith.setBackgroundDrawable(getResources().getDrawable(R.drawable.loginbtn));
}
回答by Manivannan
Exception is whoamiwithis null.
did u initialise whoamiwithlike,
ImageView whoamiwith = (ImageView)findViewById(R.id.whoamiwith)
异常whoamiwith为空。你初始化了whoamiwith，ImageView whoamiwith = (ImageView)findViewById(R.id.whoamiwith)
Refer Using setImageDrawable dynamically to set image in an ImageView
回答by Eloytxo
ImageView whoamiwith = (ImageView)findViewById(R.id.whoamiwith)
Drawable new_image= getResources().getDrawable(R.drawable.loginbtn);
whoamiwith.setBackgroundDrawable(new_image);
回答by Jitesh Dalsaniya
Just try
你试一试
ImageView whoamiwith = (ImageView)findViewById(R.id.whoamiwith)
whoamiwith.setImageResource(R.id.new_image);
回答by RussVirtuoso
ImageView whoamiwith = (ImageView)findViewById(R.id.whoamiwith);
whoamiwith.setImageResource(R.drawable.image_i_wanna_put);
