为什么我的云打印不工作？

Question

我只是从我的SD卡打印PDF文件。但是当我点击我的打印按钮时没有任何事情发生

main.xml中

<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" 
tools:context=".MainActivity" > 

<Button 
    android:id="@+id/button1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerHorizontal="true" 
    android:layout_centerVertical="true" 
    android:text="Print" /> 

main.java

public class MainActivity extends AppCompatActivity { 

//to declare a button 
Button btnPrint; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    btnPrint = (Button)findViewById(R.id.button1); 
    //set OnclickListener 
    btnPrint.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      //check the network is available or not 
      if(isNetworkAvailable() == false){ 
       Toast.makeText(MainActivity.this, "Network Connection Not Available Please Try Again Later", Toast.LENGTH_LONG).show(); 
      }else{ 
       File file = new File(Environment.getExternalStorageDirectory().getPath() + "personal/Brain Stuff.pdf"); 
       Intent printIntent = new Intent(MainActivity.this,PrintDialogActivity.class); 
       printIntent.setDataAndType(Uri.fromFile(file),"application/pdf"); 
       printIntent.putExtra("Title","Test Print"); 
      } 
     } 
    }); 
} 

public boolean isNetworkAvailable(){ 
    ConnectivityManager cm = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE); 
    NetworkInfo networkInfo = cm.getActiveNetworkInfo(); 
    //if no network is available means network ingo will be null 
    //otherwise check if we are connected 
    if(networkInfo!=null && networkInfo.isConnected()){ 
     Log.e("Network Testing","Available"); 
     return true; 
    } 
    Log.e("Network Testing","No Network Available"); 
    return false; 
} 

}

print_dialog.xml

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

<WebView 
    android:id="@+id/webview" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" /> 

清单

<uses-permission android:name="android.permission.INTERNET"></uses-permission> 
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission> 
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE"></uses-permission> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission> 

当我点击我的按钮没有发生只是同一个画面是存在的。并且我还添加了PrintDialogActivity。我犯了什么错误？引导我

Answer 1

您需要与

startActivity(printIntent);