Android的 - 从意向额外的ImageView的传递变量 [英] android - passing variable from intent extra to ImageView
问题描述
在这里Android的新人。我试图建立一个活动来显示所选图像。这code的基础是从您好,Android的第3版(程序员修炼),我试图修改。
基本上,我希望能够点击在一个活动的一个按钮,并具有启动另一个改变的布局,以显示与该按钮相关联的图像的活动。我有几个按钮,并希望每一个按钮,导致显示不同的图像。
文件(简体$除去PIC3 C $ç-...):
main.xml中:对于两个按钮(PIC1和PIC2)布局
Main.java:包含onclicklisteners的按钮 - 意图瓦特/演员(文件名映像)
Viewer.java:违约日食创建的,目的是建立新的布局的setContentView(R.layout.viewer);
viewer.xml:为ImageView的布局
我已经得到存储在strings.xml中工作(我创建一个字符串在Eclipse中使用@可绘制/ PIC1的价值,并给它imagename的名字,所以我可以叫@字符串/ imagename为ImageView的在SRC字符串viewer.xml)。
不过,我已经从搜索和阅读关于这个论坛,我不能一个活动中更改从strings.xml中值教训(我最初的想法是有code在Viewer.java将改变两行imagename字符串无论是通过了意向花絮。
我发现这个职位(http://stackoverflow.com/questions/3523384/android-pass-string-from-activity-to-layout)如果有人试图做类似的事情有一个TextView,但我已经尝试过这条路线,我不断在这些线路越来越语法错误。
我真的卡住。有任何想法吗? 谢谢!
main.java
公共类主要活动扩展实现OnClickListener {
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
//点击监听器
查看pic1Button = findViewById(R.id.pic1_button);
pic1Button.setOnClickListener(本);
查看pic2Button = findViewById(R.id.pic2_button);
pic2Button.setOnClickListener(本);
}
// ...
公共无效的onClick(视图v){
开关(v.getId()){
案例R.id.pic1_button:
意图L =新的意图(这一点,Viewer.class);
l.putExtra(映像文件名称,pic1filename);
startActivity(升);
打破;
案例R.id.pic2_button:
意图I =新的意图(这一点,Viewer.class);
i.putExtra(映像文件名称,pic2filename);
startActivity(ⅰ);
打破;
}
}
}
viewer.xml
< XML版本=1.0编码=UTF-8&GT?;
<的FrameLayout
的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
< ImageView的机器人:ID =@ + ID / ImageView的
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
机器人:SRC =@字符串/ imagename
机器人:scaleType =矩阵>
< / ImageView的>
< /的FrameLayout>
你的问题不是很清楚,但是从我的理解,你可以做到这一点用下面的code。
AndroidManifest.xml中:
< XML版本=1.0编码=UTF-8&GT?;
<舱单的xmlns:机器人=http://schemas.android.com/apk/res/android
包=com.stackoverflow.biowi
安卓版code =1
机器人:VERSIONNAME =1.0>
<应用机器人:标签=@字符串/ APP_NAME机器人:图标=@可绘制/图标>
<活动机器人:名称=主
机器人:标签=@字符串/ APP_NAME>
<意向滤光器>
<作用机器人:名称=android.intent.action.MAIN/>
<类机器人:名称=android.intent.category.LAUNCHER/>
&所述; /意图滤光器>
< /活性GT;
<活动机器人:名称=浏览器/>
< /用途>
< /舱单>
Main.java
包com.stackoverflow.biowi;
进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.View;
进口android.view.View.OnClickListener;
进口android.widget.Button;
公共类主要活动扩展实现OnClickListener
{
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate(包savedInstanceState)
{
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
//点击监听器
查看pic1Button = findViewById(R.id.pic1_button);
pic1Button.setOnClickListener(本);
查看pic2Button = findViewById(R.id.pic2_button);
pic2Button.setOnClickListener(本);
}
公共无效的onClick(视图v){
意图I =新的意图(这一点,Viewer.class);
开关(v.getId()){
案例R.id.pic1_button:
i.putExtra(映像文件名称,pic1filename);
打破;
案例R.id.pic2_button:
i.putExtra(映像文件名称,pic2filename);
打破;
}
startActivity(ⅰ);
}
}
Viewer.java:
包com.stackoverflow.biowi;
进口android.app.Activity;
进口android.os.Bundle;
进口android.widget.ImageView;
进口android.database.Cursor;
进口android.graphics.Bitmap;
进口android.graphics.BitmapFactory;
进口android.view.View;
进口android.widget.ImageView;
公共类浏览器扩展活动
{
/ **要记录在案。 * /
私人位图mImage1;
/ **要记录在案。 * /
私人位图mImage2;
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate(包savedInstanceState)
{
super.onCreate(savedInstanceState);
的setContentView(R.layout.viewer);
束束= getIntent()getExtras()。
串imageName = bundle.getString(映像文件名称);
//点击监听器
ImageView的ImageView的=(ImageView的)findViewById(R.id.imageView);
mImage1 = BitmapFactory.de codeResource(getResources(),R.drawable.pic1);
mImage2 = BitmapFactory.de codeResource(getResources(),R.drawable.pic2);
如果(imageName.matches(pic1filename)){
imageView.setImageBitmap(mImage1);
}否则,如果(imageName.matches(pic2filename)){
imageView.setImageBitmap(mImage2);
}
}
}
main.xml中:
< XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:方向=垂直
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
>
<的TextView
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT
机器人:文字=世界您好,主营
/>
<按钮机器人:ID =@ + ID / pic1_button
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文本=你好,我是一个按钮/>
<按钮机器人:ID =@ + ID / pic2_button
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =WRAP_CONTENT
机器人:文本=你好,我是一个按钮/>
< / LinearLayout中>
viewer.xml:
< XML版本=1.0编码=UTF-8&GT?;
<的FrameLayout
的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT>
< ImageView的机器人:ID =@ + ID / ImageView的
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
机器人:SRC =@可绘制/ pingouin
机器人:scaleType =矩阵>
< / ImageView的>
< /的FrameLayout>
通过pic1.png,pic2.png和pingouin.png在RES /绘制...
Android newcomer here. I'm trying to setup an activity to display a selected image. The foundation of this code is from the Hello, Android 3rd edition (Pragmatic Programmer) that I have attempted to modify.
Basically, I want to be able to click a button in one activity, and have that start another activity that changes the layout to display the image associated with that button. I have several buttons, and would like each button to cause a different image to be displayed.
files (simplified code by removing pic3-...):
main.xml : layout for two buttons (pic1 and pic2)
Main.java : contains onclicklisteners for buttons - intents w/ extras (filename for image)
Viewer.java : default created by eclipse, purpose is to set new layout setContentView(R.layout.viewer);
viewer.xml : layout for ImageView
I have gotten strings stored in strings.xml to work (I create a string in eclipse with a value of @drawable/pic1 and give it a name of imagename so I can call @string/imagename for the src of ImageView in viewer.xml).
However, I have learned from searching and reading on this forum that I cannot change strings.xml values from within an activity (my original idea was to have a couple lines of code in Viewer.java that would change the imagename string to whatever was passed by the Intent extras.
I found this post (http://stackoverflow.com/questions/3523384/android-pass-string-from-activity-to-layout) where someone was trying to do a similar thing with a TextView, but I've tried that route and I keep getting syntax errors on those lines.
I'm really stuck. Any ideas? Thanks!
main.java
public class Main extends Activity implements OnClickListener {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// click listeners
View pic1Button = findViewById(R.id.pic1_button);
pic1Button.setOnClickListener(this);
View pic2Button = findViewById(R.id.pic2_button);
pic2Button.setOnClickListener(this);
}
// ...
public void onClick(View v) {
switch (v.getId()) {
case R.id.pic1_button:
Intent l = new Intent(this, Viewer.class);
l.putExtra("imagefilename", "pic1filename");
startActivity(l);
break;
case R.id.pic2_button:
Intent i = new Intent(this, Viewer.class);
i.putExtra("imagefilename", "pic2filename");
startActivity(i);
break;
}
}
}
viewer.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView android:id="@+id/imageView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src='@string/imagename'
android:scaleType="matrix">
</ImageView>
</FrameLayout>
Your question is not very clear but from my understanding you could achieve that using the following code.
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.stackoverflow.biowi"
android:versionCode="1"
android:versionName="1.0">
<application android:label="@string/app_name" android:icon="@drawable/icon">
<activity android:name="Main"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="Viewer" />
</application>
</manifest>
Main.java:
package com.stackoverflow.biowi;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Main extends Activity implements OnClickListener
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// click listeners
View pic1Button = findViewById(R.id.pic1_button);
pic1Button.setOnClickListener(this);
View pic2Button = findViewById(R.id.pic2_button);
pic2Button.setOnClickListener(this);
}
public void onClick(View v) {
Intent i = new Intent(this, Viewer.class);
switch (v.getId()) {
case R.id.pic1_button:
i.putExtra("imagefilename", "pic1filename");
break;
case R.id.pic2_button:
i.putExtra("imagefilename", "pic2filename");
break;
}
startActivity(i);
}
}
Viewer.java:
package com.stackoverflow.biowi;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ImageView;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.View;
import android.widget.ImageView;
public class Viewer extends Activity
{
/** To be documented. */
private Bitmap mImage1;
/** To be documented. */
private Bitmap mImage2;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.viewer);
Bundle bundle = getIntent().getExtras();
String imageName = bundle.getString("imagefilename");
// click listeners
ImageView imageView = (ImageView)findViewById(R.id.imageView);
mImage1 = BitmapFactory.decodeResource(getResources(), R.drawable.pic1);
mImage2 = BitmapFactory.decodeResource(getResources(), R.drawable.pic2);
if(imageName.matches("pic1filename")) {
imageView.setImageBitmap(mImage1);
} else if (imageName.matches("pic2filename")) {
imageView.setImageBitmap(mImage2);
}
}
}
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Hello World, Main"
/>
<Button android:id="@+id/pic1_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello, I am a Button" />
<Button android:id="@+id/pic2_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello, I am a Button" />
</LinearLayout>
viewer.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView android:id="@+id/imageView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src='@drawable/pingouin'
android:scaleType="matrix">
</ImageView>
</FrameLayout>
With pic1.png, pic2.png and pingouin.png in res/drawable…
这篇关于Android的 - 从意向额外的ImageView的传递变量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!