我想设置通过我的应用程序保存在SD卡上的主要布局的背景图像 [英] I want to set an image saved on sd card in main layout background through my application

问题描述

我创造的，我想设置在主XML linearlayout.I不同的背景图片都保存在SD卡上5个图像文件。现在我要选择一个事先知情同意，并设置为我的残废XML的LinearLayout background.so它的应用程序将取代previous形象，展示新形象作为背景。

i am creating an application in which i want set different background images in main xml linearlayout.I have stored 5 image files on sd card .now i want to select a pic and set it as my maim xml linearlayout background.so it will replace the previous image and display the new image as background.

推荐答案

首先一个id分配到主的xml的LinearLayout，例如在下面的情况下，它被命名为容器

First assign an id to the main xml linearlayout, for example in the following case it is named" container"

    <!-- 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"
    android:id="@+id/container">
    <TextView  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="@string/hello"
        />
</LinearLayout>

然后在的.java code，你可以找到的布局对象，并设置一个绘制为背景：

Then in the .java code you can find the layout object and set a drawable as its background:

package org.example.app;

import android.app.Activity;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;

public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        String pathName = "/sdcard/gif001.gif";
        Resources res = getResources();
        Bitmap bitmap = BitmapFactory.decodeFile(pathName);
        BitmapDrawable bd = new BitmapDrawable(res, bitmap);
        View view = findViewById(R.id.container);
        view.setBackgroundDrawable(bd);
    }
}

问候

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