这是XML布局:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/search_lyt"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:name="search_act"
tools:context="com.example.app.Hisp$PlaceholderFragment">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/imageView2"
android:src="@drawable/hispania_lgs"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Back"
android:id="@+id/back2"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Info"
android:id="@+id/info2"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true" />
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/model_list"
android:layout_below="@+id/textViewML"
android:layout_alignParentRight="true"
android:layout_above="@+id/back2"
android:choiceMode="singleChoice" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="Select any of the models below and press Info for the model's specifications"
android:id="@+id/textViewML"
android:layout_below="@+id/imageView2"
android:layout_alignLeft="@+id/model_list" />
使用setContentView方法会导致'Application stopped working'。
setContentView(R.layout.search_hisp);
有关如何解决此问题的任何想法?我对Android开发还很陌生,仍然试图找到如何以正确的方式切换布局。
好吧,即使我将onCreate()'setContentView更改为R.layout.search_hisp并在启动时给我错误。所以我的猜测可能来自XML文件或其他东西。
提前致谢!
编辑,出现错误:
&GT;
03-25 12:10:23.415 20858-20858/com.example.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.EditText
at com.example.app.Hisp.beginSearch(Hisp.java:121)
at com.example.app.Hisp$3.onClick(Hisp.java:107)
at android.view.View.performClick(View.java:4231)
at android.view.View$PerformClick.run(View.java:17537)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:5751)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
at dalvik.system.NativeStart.main(Native Method)
03-25 12:10:23.420 515-550/? E/EmbeddedLogger﹕ App crashed! Process: com.example.app
03-25 12:10:23.420 515-550/? E/EmbeddedLogger﹕ App crashed! Package: com.example.app v1 (1.0)
03-25 12:10:23.420 515-550/? E/EmbeddedLogger﹕ Application Label: Hisp_Selector
这是代码:
package com.example.app;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentSender;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.res.AssetManager;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.database.DataSetObserver;
import android.database.DatabaseErrorHandler;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Handler;
import android.os.Looper;
import android.os.UserHandle;
import android.preference.DialogPreference;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View.OnClickListener;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.view.ViewGroup;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.view.Window;
import android.view.WindowManager;
import android.os.Build;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.ListAdapter;
import android.widget.ListView;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import android.widget.LinearLayout;
public class Hisp extends ActionBarActivity {
public static ActionBarActivity activity;
Context ctx;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
activity = this;
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_hisp);
TextView txt = (TextView) findViewById(R.id.textViewML);
Button btn = (Button) g(R.id.search);
Button rst = (Button) g(R.id.reset);
rst.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
finish();
startActivity(getIntent());
}
});
OnClickListener _rdb = new OnClickListener() {
@Override
public void onClick(View view) {
((CheckBox) g(R.id.R134a)).setChecked(false);
((CheckBox) g(R.id.R22)).setChecked(false);
((CheckBox) g(R.id.R404A)).setChecked(false);
((CheckBox) g(R.id.R507A)).setChecked(false);
((CheckBox) view).setChecked(true);
}
};
((CheckBox) g(R.id.R134a)).setOnClickListener(_rdb);
((CheckBox) g(R.id.R22)).setOnClickListener(_rdb);
((CheckBox) g(R.id.R404A)).setOnClickListener(_rdb);
((CheckBox) g(R.id.R507A)).setOnClickListener(_rdb);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
beginSearch();
}
});
/*
if (stanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
*/
}
public void beginSearch() {
((EditText) g(R.id.rh)).setText("Test##".toCharArray(), 0, "Test##".length());
Boolean err = false;
try {
if (!(Double.parseDouble((((EditText) g(R.id.capacity)).getText().toString().trim())) >= 0 &&
isBetween(-35, 5, Integer.parseInt(((EditText) g(R.id.evaptemp)).getText().toString().trim())) &&
isBetween(28, 58, Integer.parseInt(((EditText) g(R.id.condtemp)).getText().toString().trim())) &&
isBetween(5, 13, Integer.parseInt(((EditText) g(R.id.dt1)).getText().toString().trim()))
)) err = true;
} catch(Exception e) {
err = true;
}
if (err) {
showMessageBox("ERROR", "Make sure you have filled all the fields correctly.", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}
});
} else {
setContentView(R.layout.search_hisp);
}
}
public View g(int id) {
return activity.findViewById(id);
}
public Boolean isBetween(Integer i1, Integer i2, Integer ix) {
if (ix >= i1 && ix <= i2) return true;
return false;
}
public void showMessageBox(Object ttl, Object msg, DialogInterface.OnClickListener rt) {
new AlertDialog.Builder(activity)
.setMessage(msg.toString())
.setTitle(ttl.toString())
.setCancelable(false)
.setNeutralButton(android.R.string.ok, rt)
.show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.hisp, 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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_hisp, container, false);
return rootView;
}
}
}
答案 0 :(得分:1)
加入onCreate:
TextView textViewML = (TextView) findViewById(R.id.textViewML);
答案 1 :(得分:1)
因为在onCreate()中你使用了
EditText textViewML = (EditText) findViewById(R.id.textViewML);
而不是
TextView txt = (TextView) findViewById(R.id.textViewML);
所以你遇到了问题。所以你需要在setContentView()方法之后使用。
TextView txt = (TextView) findViewById(R.id.textViewML);
答案 2 :(得分:0)
您正在将Textview转换为EditText而不执行该操作
EditText textViewML = (EditText) findViewById(R.id.textViewML);
将其更改为
TextView textViewML = (TextView) findViewById(R.id.textViewML);
答案 3 :(得分:0)
异常不是你的java文件中的布局文件,而是将TextView转换为EditText。
您无法将超类投射到子类中。 你可以将Sub类转换为Super Class。
您可以将EditText转换为TextView,但不能将TextView转换为EditText。
更改此行
TextView txt = (TextView) findViewById(R.id.textViewML);
感谢名单
答案 4 :(得分:0)
错误来自
((EditText) g(R.id.rh)).setText("Test##".toCharArray(), 0, "Test##".length());
非常感谢你们指出这一点!