如何在Android的ImageView中添加触摸功能? [英] How can I add touch functionality to an ImageView in android?
问题描述
我对android很陌生，想知道如何向其中添加某种类型的功能，然后按ImageView.我的活动Java文件中的当前代码如下
I'm pretty new to android and was wondering how I could add some type of functionality to and ImageView is I press it. My current code in my activity java file is as follows
package com.example.crystalbabyheaven;
import android.app.Activity;
import android.util.Log;
import android.view.*;
import android.view.View.OnTouchListener;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ScrollView;
import android.widget.ImageView;
public class MainActivity extends Activity implements Runnable {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ScrollView sv = (ScrollView) findViewById(R.id.ScrollView);
Handler h = new Handler();
h.postDelayed(new Runnable() {
@Override
public void run() {
sv.scrollTo(0, 8000);
}
}, 100);
ImageView player = new ImageView(this);
player.setImageDrawable(getResources().getDrawable(R.drawable.crystalbaby));
player.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event){
sv.scrollTo(0, 5000);
return true;
}
});
}
@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 void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
ScrollView sv = (ScrollView) findViewById(R.id.ScrollView);
sv.scrollTo(300, 300);
}*/
@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);
}
@Override
public void run() {
// TODO Auto-generated method stub
}
}
这是我的XML:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mainLayout"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.crystalbabyheaven.MainActivity" >
<ScrollView
android:id = "@+id/ScrollView"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="@drawable/bg" />
</ScrollView>
<ImageView
android:id="@+id/crystalBaby"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_gravity="bottom"
android:src="@drawable/crystalbaby" />
</FrameLayout>
我有一个非常大的图像，它从地球的图片开始，一直向上滚动到大气层，进入太空.我在此背景之上有另一个图像视图.我在onCreate中的代码的第一部分将scrollview视图设置为图像的底部.在这种情况下，我想做的是，当我在角落按图像时，大约滚动到图像的中间.我实际上想要一些不同的东西，但是我想先进行测试.我的代码有问题吗?我很茫然.
I have a very large image that starts from a picture of the earth and scrolls upward through the atmosphere into space. I have another image view on top of this background. The first portion of my code in onCreate sets the scrollview view to the bottom of the image. What I want to do in this case is scroll approximately to the middle of the image when I press the image in the corner. I actually want something different, but I want to test this before anything. Is there something wrong in my code? I'm at a loss.
推荐答案
您正在创建ImageView播放器，但这与xml中的imageview不同.为什么不这样做:Imageview player =(ImageView)findViewById(R.id.imageview_player) 并在您的xml中，将android:id ="@ + id/imagview_player"放在imageview内.
You're creating an ImageView player, but this is not the same as the imageview in your xml. Why not do: Imageview player = (ImageView)findViewById(R.id.imageview_player) and in your xml, put android:id="@+id/imagview_player" inside the imageview.
或者，如果您必须以编程方式创建imageview，则将其添加到布局中.您不会在代码中的任何地方将其添加到布局中.
Or if you must create the imageview programatically, then add it to your layout. You are not adding it to your layout anywhere in the code.
这篇关于如何在Android的ImageView中添加触摸功能?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
