android開發之歡迎界面的小例子

2020-04-11 12:16:42

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供稿：網友

首先你得寫好xml文件，這也是最主要的。

然后，在activity中加入一個線程，延時2秒，用來跳轉到主界面。

activity中線程代碼如下：(順便檢測一下網絡是否打開）

[java]

復制代碼代碼如下:

@Override
 protected void onStart() {
 super.onStart();
 if(isNetworkConnected()){
 new Thread(){
 @Override
 public void run() {
 try {
 Thread.sleep(2000);
 Intent intent = new Intent(SplashActivity.this,CompusAssistMain.class);
 startActivity(intent);
 finish();
 } catch (InterruptedException e) {
 e.printStackTrace();
 }

 }
 }.start();
 }else{
 //彈出對話框讓用戶設置網絡
 AlertDialog.Builder builder = new Builder(this);
 builder.setTitle("設置網絡");
 builder.setMessage("網絡錯誤請設置網絡");
 builder.setPositiveButton("設置網絡", new OnClickListener() {
 public void onClick(DialogInterface dialog, int which) {
 Intent intent = new Intent();
 intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
 startActivity(intent);
 }
 });
 builder.setNegativeButton("取消", new OnClickListener() {

 public void onClick(DialogInterface dialog, int which) {
 finish();
 }
 });
 builder.create().show();
 }
 }

@Override
protected void onStart() {
super.onStart();
if(isNetworkConnected()){
   new Thread(){
    @Override
    public void run() {
     try {
      Thread.sleep(2000);
      Intent intent = new Intent(SplashActivity.this,CompusAssistMain.class);
      startActivity(intent);
      finish();
     } catch (InterruptedException e) {
      e.printStackTrace();
     }

    }
   }.start();
}else{
   //彈出對話框讓用戶設置網絡
   AlertDialog.Builder builder = new Builder(this);
   builder.setTitle("設置網絡");
   builder.setMessage("網絡錯誤請設置網絡");
   builder.setPositiveButton("設置網絡", new OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
     Intent intent = new Intent();
     intent.setClassName("com.android.settings", "com.android.settings.WirelessSettings");
     startActivity(intent);
    }
   });
   builder.setNegativeButton("取消", new OnClickListener() {

    public void onClick(DialogInterface dialog, int which) {
     finish();
    }
   });
   builder.create().show();
}
}檢測網絡的類isNetWorkConnected():

[java]

復制代碼代碼如下:

/**
 * 判斷系統的網絡是否可用
 * @return
 */
 private boolean isNetworkConnected(){
 ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
 NetworkInfo info =cm.getActiveNetworkInfo();
 if(info!=null&&info.isConnected()){
 return true;
 }else {
 return false ;
 }

/**
* 判斷系統的網絡是否可用
* @return
*/
private boolean isNetworkConnected(){
ConnectivityManager cm = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo info =cm.getActiveNetworkInfo();
if(info!=null&&info.isConnected()){
return true;
}else {
return false ;
}

這樣就完成了一個歡迎界面，給自已的應用加點色彩。當然還要添加配置在Manifest文件中
[html]

復制代碼代碼如下: