android点击打开文件,android：如何让我的应用程序在点击时打开特定的PDF文件

public class ghcm_Submenu1 extends Activity {

private ListView lv1;

private String lv_arr[]= {"item1", "item2"};

@Override

public void onCreate(Bundle icicle)

{

super.onCreate(icicle);

setContentView(R.layout.submenu);

lv1=(ListView)findViewById(R.id.ListView01);

// By using setAdpater method in listview we an add string array in list.

lv1.setAdapter(new ArrayAdapter(this,android.R.layout.simple_list_item_1 , lv_arr));

lv1.setOnItemClickListener(new AdapterView.OnItemClickListener() {

public void onItemClick(AdapterView parentView, View childView, int position, long id) {

if ((position)== 0){

Intent intent = new Intent();

File file = new File("/sdcard/item1.pdf");

if (file.exists()) {

Uri path = Uri.fromFile(file);

intent.setAction(Intent.ACTION_VIEW);

intent.setDataAndType(path, "application/pdf");

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

try {

startActivity(intent);

}

catch (ActivityNotFoundException e) {

Toast.makeText(ghcm_Submenu1.this,

"No Application Available to View PDF",

Toast.LENGTH_SHORT).show();

}

}

}

else if ((position)== 1){

Intent intent = new Intent();

File file = new File("/sdcard/item2.pdf");

if (file.exists()) {

Uri path = Uri.fromFile(file);

intent.setAction(Intent.ACTION_VIEW);

intent.setDataAndType(path, "application/pdf");

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

try {

startActivity(intent);

}

catch (ActivityNotFoundException e) {

Toast.makeText(ghcm_Submenu1.this,

"No Application Available to View PDF",

Toast.LENGTH_SHORT).show();

}

}

}

}

public void onNothingSelected(AdapterView parentView) {

}

});

}