利用Intent，打开word，pdf等文件

本例演示如何通过Intent来打开手机sd卡中的word，pdf文件，这里实际上是通过Intent打开手机中能够阅读word，或pdf的应用，让那个应用来打开文件。而不是我们这个例子本身能够打开文件。

直接上代码：

activity_main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     >

    <Button
        android:id="@+id/btn_open_word"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="打开word" />
    
    <Button
        android:id="@+id/btn_open_pdf"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:layout_below="@+id/btn_open_word"
        android:text="打开pdf" />

</RelativeLayout>

MainActivity.java:

public class MainActivity extends Activity {

	private static final String TAG = "MainActivity";
	
	private Button btnOpenWord;
	private Button btnOpenPdf;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		btnOpenWord = (Button)findViewById(R.id.btn_open_word);
		btnOpenPdf = (Button)findViewById(R.id.btn_open_pdf);
		
		btnOpenWord.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				
				File file = new File(getSDPath()+"/***.doc");//这里更改为你的名称

                Log.e(TAG, "file exsit："+file.getPath());
                
                if (file.exists()) {
                    Uri path = Uri.fromFile(file);
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    intent.setDataAndType(path, "application/msword");
                    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                    try {
                        startActivity(intent);
                    } 
                    catch (ActivityNotFoundException e) {
                        Toast.makeText(MainActivity.this, 
                            "No Application Available to View WORD", 
                            Toast.LENGTH_SHORT).show();
                    }
                }
			}
		});
		
		btnOpenPdf.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                File file = new File(getSDPath()+"/***.pdf");//这里更改为你的名称

                Log.e(TAG, "file exsit："+file.exists());
                
                if (file.exists()) {
                    Uri path = Uri.fromFile(file);
                    Intent intent = new Intent(Intent.ACTION_VIEW);
                    intent.setDataAndType(path, "application/pdf");
                    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                    try {
                        startActivity(intent);
                    } 
                    catch (ActivityNotFoundException e) {
                        Toast.makeText(MainActivity.this, 
                            "No Application Available to View PDF", 
                            Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });
	}

	/**
	 * 获取sd卡路径
	 * 
	 * */
	private String getSDPath(){
		
	       File sdDir = null;
	       boolean sdCardExist = android.os.Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());//判断sd卡是否存在
	       if(sdCardExist){
	    	   
	          sdDir = Environment.getExternalStorageDirectory();//获取目录
	       }  
	       
	       Log.e(TAG, "sdCard:"+sdDir.toString());
	       return sdDir.toString();
	} 

}

在我的机器Nexus s中，能够通过Document Viewer正常打开word和pdf