如何从Android的资产文件夹中打开PDF文件？ [英] How to open PDF file in Android from the assets folder?

问题描述

没有任何一个对如何在Android中打开PDF文件的想法？我的code相本这样的：

 公共类SampleActivity延伸活动{    @覆盖
    保护无效的onCreate（捆绑savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.main）;
        CopyReadAssets（）;
    }    私人无效CopyReadAssets（）{
        AssetManager assetManager = getAssets（）;        在的InputStream = NULL;
        出的OutputStream = NULL;
        档案文件=新的文件（getFilesDir（），git.pdf）;
        尝试{
            在= assetManager.open（git.pdf）;
            OUT = openFileOutput（file.getName（），Context.MODE_WORLD_READABLE）;            copyFile（IN，OUT）;
            附寄（）;
            在= NULL;
            了out.flush（）;
            out.close（）;
            出= NULL;
        }赶上（例外五）{
            Log.e（标签，e.getMessage（））;
        }        意向意图=新意图（Intent.ACTION_VIEW）;
        intent.setDataAndType（
                Uri.parse（文件：//+ getFilesDir（）+/git.pdf），
                应用程序/ PDF格式）;        startActivity（意向）;
    }    私人无效copyFile（在的InputStream，OutputStream的了）抛出IOException
        字节[]缓冲区=新的字节[1024];
        INT读;
        而（（读= in.read（缓冲））！= -1）{
            out.write（缓冲，0，读）;
        }
    }
}
 

解决方案

下面是code从资产的文件夹中打开PDF文件，但你必须有你的设备上安装PDF阅读器：

 私人无效CopyAssets（）{        AssetManager assetManager = getAssets（）;        在的InputStream = NULL;
        出的OutputStream = NULL;
        档案文件=新的文件（getFilesDir（），fileName.pdf）;
        尝试{
            在= assetManager.open（fileName.pdf）;
            OUT = openFileOutput（file.getName（），Context.MODE_WORLD_READABLE）;            copyFile（IN，OUT）;
            附寄（）;
            在= NULL;
            了out.flush（）;
            out.close（）;
            出= NULL;
        }赶上（例外五）{
            Log.e（标签，e.getMessage（））;
        }        意向意图=新意图（Intent.ACTION_VIEW）;
        intent.setDataAndType（
                Uri.parse（文件：//+ getFilesDir（）+/fileName.pdf），
                应用程序/ PDF格式）;        startActivity（意向）;
    }    私人无效copyFile（在的InputStream，OutputStream的了）抛出IOException
        字节[]缓冲区=新的字节[1024];
        INT读;
        而（（读= in.read（缓冲））！= -1）{
            out.write（缓冲，0，读）;
        }
    }
 

Does any one has an idea on how to open a PDF file in Android? My code looks this this:

public class SampleActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        CopyReadAssets();    
    }

    private void CopyReadAssets() {
        AssetManager assetManager = getAssets();

        InputStream in = null;
        OutputStream out = null;
        File file = new File(getFilesDir(), "git.pdf");
        try {
            in = assetManager.open("git.pdf");
            out = openFileOutput(file.getName(), Context.MODE_WORLD_READABLE);

            copyFile(in, out);
            in.close();
            in = null;
            out.flush();
            out.close();
            out = null;
        } catch (Exception e) {
            Log.e("tag", e.getMessage());
        }

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(
                Uri.parse("file://" + getFilesDir() + "/git.pdf"),
                "application/pdf");

        startActivity(intent);
    }

    private void copyFile(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[1024];
        int read;
        while ((read = in.read(buffer)) != -1) {
            out.write(buffer, 0, read);
        }
    }
}

解决方案

Here is the code for opening pdf file from asset folder, but you must have pdf reader installed on your device :

    private void CopyAssets() {

        AssetManager assetManager = getAssets();

        InputStream in = null;
        OutputStream out = null;
        File file = new File(getFilesDir(), "fileName.pdf");
        try {
            in = assetManager.open("fileName.pdf");
            out = openFileOutput(file.getName(), Context.MODE_WORLD_READABLE);

            copyFile(in, out);
            in.close();
            in = null;
            out.flush();
            out.close();
            out = null;
        } catch (Exception e) {
            Log.e("tag", e.getMessage());
        }

        Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(
                Uri.parse("file://" + getFilesDir() + "/fileName.pdf"),
                "application/pdf");

        startActivity(intent);
    }

    private void copyFile(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[1024];
        int read;
        while ((read = in.read(buffer)) != -1) {
            out.write(buffer, 0, read);
        }
    }

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