package com.example.mypptcontrol;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
private Button loginButton1;
private Button loginButton2;
private Button loginButton3;
private Button loginButton4;
private Button loginButton5;
public String ppt;
PrintWriter pw = null;
Socket socket=null;
OutputStream os=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化连接按钮
loginButton1 =(Button) findViewById(R.id.button2);
loginButton2 =(Button) findViewById(R.id.button5);
loginButton3 =(Button) findViewById(R.id.button6);
loginButton4 =(Button) findViewById(R.id.button4);
loginButton4 =(Button) findViewById(R.id.button1);
EditText et = (EditText)findViewById(R.id.editText1);
//获取edittext文本内容
String value1 = et.getText().toString();
EditText et2 = (EditText)findViewById(R.id.editText2);
loginButton1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO 自动生成的方法存根
try {
socket=new Socket("123.150.226.119",7777);
os=socket.getOutputStream();
pw= new PrintWriter(os);
} catch (UnknownHostException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
});
loginButton2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO 自动生成的方法存根
ppt="F6";
}
});
loginButton3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO 自动生成的方法存根
ppt="last";
}
});
loginButton4.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO 自动生成的方法存根
ppt="next";
}
});
loginButton5.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO 自动生成的方法存根
ppt="stop";
}
});
if(ppt!="stop"){
pw.write(ppt);
pw.flush();
}else{
pw.write(ppt);
pw.flush();
pw.flush();
try {
os.close();
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
try {
socket.close();
} catch (IOException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
}
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
上面是MainActivity的代码
10-27 08:01:43.183: D/AndroidRuntime(1151): Shutting down VM
10-27 08:01:43.183: W/dalvikvm(1151): threadid=1: thread exiting with uncaught exception (group=0xb3adaba8)
10-27 08:01:43.203: E/AndroidRuntime(1151): FATAL EXCEPTION: main
10-27 08:01:43.203: E/AndroidRuntime(1151): Process: com.example.mypptcontrol, PID: 1151
10-27 08:01:43.203: E/AndroidRuntime(1151): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mypptcontrol/com.example.mypptcontrol.MainActivity}: java.lang.NullPointerException
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.app.ActivityThread.access$800(ActivityThread.java:135)
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.os.Handler.dispatchMessage(Handler.java:102)
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.os.Looper.loop(Looper.java:136)
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.app.ActivityThread.main(ActivityThread.java:5001)
10-27 08:01:43.203: E/AndroidRuntime(1151): at java.lang.reflect.Method.invokeNative(Native Method)
10-27 08:01:43.203: E/AndroidRuntime(1151): at java.lang.reflect.Method.invoke(Method.java:515)
10-27 08:01:43.203: E/AndroidRuntime(1151): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
10-27 08:01:43.203: E/AndroidRuntime(1151): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
10-27 08:01:43.203: E/AndroidRuntime(1151): at dalvik.system.NativeStart.main(Native Method)
10-27 08:01:43.203: E/AndroidRuntime(1151): Caused by: java.lang.NullPointerException
10-27 08:01:43.203: E/AndroidRuntime(1151): at com.example.mypptcontrol.MainActivity.onCreate(MainActivity.java:90)
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.app.Activity.performCreate(Activity.java:5231)
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-27 08:01:43.203: E/AndroidRuntime(1151): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
10-27 08:01:43.203: E/AndroidRuntime(1151): ... 11 more
10-27 08:01:48.223: I/Process(1151): Sending signal. PID: 1151 SIG: 9
这是eclipse报错 求大神看看
我就是想做一个手机控制电脑ppt播放 这是客户端