我的应用程序中有一些textview,想要检查textview上的文本属性是否为值或为null.然后我想显示一个吐司,如果我的textview上的值为null
但是吐司没有按照预期运行
这是我的代码:
public class brekeleV2 extends Activity {
static Context context;
brekeleV2Model r = new brekeleV2Model();
private EditText jalan, kota, postal;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
context = getApplicationContext();
Button go = (Button)findViewById(R.id.go);
go.setOnClickListener(onGo);
Button reset = (Button)findViewById(R.id.reset);
reset.setOnClickListener(onRes);
jalan =(EditText)findViewById(R.id.jalan);
kota =(EditText)findViewById(R.id.kota);
postal =(EditText)findViewById(R.id.post);
jalan.setText(null);
kota.setText(null);
postal.setText(null);
}
这是onClick方法代码:
private View.OnClickListener onGo=new View.OnClickListener() {
public void onClick(View v) {
if (jalan.getText()!= null && kota.getText()!=null){
switch(v.getId()){
case …我在我的Android应用程序上尝试相机预览.当我试用我的真实设备时,它会给我黑屏.
这是我的代码,它不会抛出任何错误,但屏幕仍然是黑色的.有任何想法吗？
import android.app.Activity;
import android.content.Context;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.FrameLayout;
public class ARrazerNav extends Activity{
public void onCreate(Bundle savedInstanceState){
try{
super.onCreate(savedInstanceState);
CustomCameraView cv = new CustomCameraView(this.getApplicationContext());
FrameLayout r1 = new FrameLayout(this.getApplicationContext());
setContentView(r1);
r1.addView(r1);
}catch (Exception e) {
// TODO: handle exception
}
}
public class CustomCameraView extends SurfaceView{
Camera camera;
SurfaceHolder previewHolder;
public CustomCameraView(Context ctx){
super(ctx);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
previewHolder.addCallback(surfaceHolderListener);
}
SurfaceHolder.Callback surfaceHolderListener = new SurfaceHolder.Callback(){
public void surfaceDestroyed(SurfaceHolder holder) {
// …我尝试一个简单的webView应用程序.这是我的代码:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mWebView = (WebView)findViewById(R.id.webview);
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.loadUrl("http://eepis-its.edu");
}
public class myWebClient extends WebViewClient{
public void onPageStarted(WebView view, String url, Bitmap favicon){
super.onPageStarted(view, url, favicon);
}
public boolean shouldOverrideUrlLoading(WebView view, String url){
view.loadUrl(url);
return true;
}
}
public boolean onKeyDown(int keyCode, KeyEvent event){
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()){
mWebView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
并且,当我尝试单击该站点上的超链接时,我重定向到移动浏览器.为什么会发生？我想要的是,当我点击它在webview上的超链接时.
请帮我.
我有一个问题.我从我的解析器类的结果中得到了ArrayList.那么我想把这个值(ArrayList中的值)放到TextView上.
这是我迄今为止所做的工作.我在main.xml上创建TextView
<TextView
android:id="@+id/deskripsi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
在我的onCreate方法中,我初始化了文本视图
desk = (TextView)findViewById(R.id.deskripsi);
然后我试图从谷歌地图和节点地标解析KML文件我把它的值放到ArrayList,这里我的代码
ArrayList<String> pathName = new ArrayList<String>();
Object[] objPlace;
//Parser Node Placemark
NodeList nlPlace = doc.getElementsByTagName("Placemark");
for(int p = 0; p < nlPlace.getLength(); p++){
Node rootPlace = nlPlace.item(p);
NodeList itemPlace = rootPlace.getChildNodes();
for(int y = 0; y < itemPlace.getLength(); y++){
Node placeStringNode = itemPlace.item(y);
NodeList place = placeStringNode.getChildNodes();
//valueName = nameList.item(0).getNodeValue().toString() + "+";
pathName.add(place.item(0).getNodeValue());
}
}
objPlace = pathName.toArray();
desk.setText("");
for (int j = 0; j < objPlace.length; j++){ …