Guyz这似乎很容易，但对我来说实施起来有点困难。我正在使用listview来显示mysqlite数据库。
请进行更改，以便我自定义textview，即大小，颜色，字体以xml显示。
由于初学者标签，我很难实现。
//主要活动
import java.util.ArrayList;
import android.app.ListActivity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ListActivity {
private static final String DB_NAME = "friendlist";
private static final String TABLE_NAME = "friends";
private static final String FRIEND_ID = "_id";
private static final String FRIEND_NAME = "name";
private SQLiteDatabase database;
private ListView listView;
private ArrayList<String> friends;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ExternalDbOpenHelper dbOpenHelper = new ExternalDbOpenHelper(this, DB_NAME);
database = dbOpenHelper.openDataBase();
fillFreinds();
setUpList();
}
private void setUpList() {
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, friends));
listView = getListView();
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position,long id) {
Toast.makeText(getApplicationContext(),
((TextView) view).getText().toString(),
Toast.LENGTH_SHORT).show();
}
});
}
private void fillFreinds() {
friends = new ArrayList<String>();
Cursor friendCursor = database.query(TABLE_NAME,
new String[]
{FRIEND_ID, FRIEND_NAME},
null, null, null, null
, FRIEND_NAME);
friendCursor.moveToFirst();
if(!friendCursor.isAfterLast()) {
do {
String name = friendCursor.getString(1);
friends.add(name);
} while (friendCursor.moveToNext());
}
friendCursor.close();
}
}
// ExternalDbOpenHelper
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class ExternalDbOpenHelper extends SQLiteOpenHelper {
public static String DB_PATH;
public static String DB_NAME;
public SQLiteDatabase database;
public final Context context;
public SQLiteDatabase getDb() {
return database;
}
public ExternalDbOpenHelper(Context context, String databaseName) {
super(context, databaseName, null, 1);
this.context = context;
String packageName = context.getPackageName();
DB_PATH = String.format("//data//data//%s//databases//", packageName);
DB_NAME = databaseName;
openDataBase();
}
public void createDataBase() {
boolean dbExist = checkDataBase();
if (!dbExist) {
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
Log.e(this.getClass().toString(), "Copying error");
throw new Error("Error copying database!");
}
} else {
Log.i(this.getClass().toString(), "Database already exists");
}
}
private boolean checkDataBase() {
SQLiteDatabase checkDb = null;
try {
String path = DB_PATH + DB_NAME;
checkDb = SQLiteDatabase.openDatabase(path, null,
SQLiteDatabase.OPEN_READONLY);
} catch (SQLException e) {
Log.e(this.getClass().toString(), "Error while checking db");
}
if (checkDb != null) {
checkDb.close();
}
return checkDb != null;
}
private void copyDataBase() throws IOException {
InputStream externalDbStream = context.getAssets().open(DB_NAME);
String outFileName = DB_PATH + DB_NAME;
OutputStream localDbStream = new FileOutputStream(outFileName);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = externalDbStream.read(buffer)) > 0) {
localDbStream.write(buffer, 0, bytesRead);
}
localDbStream.close();
externalDbStream.close();
}
public SQLiteDatabase openDataBase() throws SQLException {
String path = DB_PATH + DB_NAME;
if (database == null) {
createDataBase();
database = SQLiteDatabase.openDatabase(path, null,
SQLiteDatabase.OPEN_READWRITE);
}
return database;
}
@Override
public synchronized void close() {
if (database != null) {
database.close();
}
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}
}
修改 自定义TextView XML：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp" android:text="TextView" />
</LinearLayout>
//错误
09-09 16:55:36.970: E/ArrayAdapter(906): You must supply a resource ID for a TextView
09-09 16:55:36.980: D/AndroidRuntime(906): Shutting down VM
09-09 16:55:36.980: W/dalvikvm(906): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
09-09 16:55:37.041: E/AndroidRuntime(906): FATAL EXCEPTION: main
09-09 16:55:37.041: E/AndroidRuntime(906): java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:386)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.AbsListView.obtainView(AbsListView.java:2271)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.ListView.makeAndAddView(ListView.java:1769)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.ListView.fillDown(ListView.java:672)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.ListView.fillFromTop(ListView.java:733)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.ListView.layoutChildren(ListView.java:1622)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.AbsListView.onLayout(AbsListView.java:2106)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.View.layout(View.java:13754)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.ViewGroup.layout(ViewGroup.java:4364)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1649)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1507)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.LinearLayout.onLayout(LinearLayout.java:1420)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.View.layout(View.java:13754)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.ViewGroup.layout(ViewGroup.java:4364)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.View.layout(View.java:13754)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.ViewGroup.layout(ViewGroup.java:4364)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1649)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1507)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.LinearLayout.onLayout(LinearLayout.java:1420)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.View.layout(View.java:13754)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.ViewGroup.layout(ViewGroup.java:4364)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.View.layout(View.java:13754)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.ViewGroup.layout(ViewGroup.java:4364)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1868)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1689)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.Choreographer.doFrame(Choreographer.java:525)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.os.Handler.handleCallback(Handler.java:615)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.os.Handler.dispatchMessage(Handler.java:92)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.os.Looper.loop(Looper.java:137)
09-09 16:55:37.041: E/AndroidRuntime(906): at android.app.ActivityThread.main(ActivityThread.java:4745)
09-09 16:55:37.041: E/AndroidRuntime(906): at java.lang.reflect.Method.invokeNative(Native Method)
09-09 16:55:37.041: E/AndroidRuntime(906): at java.lang.reflect.Method.invoke(Method.java:511)
09-09 16:55:37.041: E/AndroidRuntime(906): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
09-09 16:55:37.041: E/AndroidRuntime(906): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-09 16:55:37.041: E/AndroidRuntime(906): at dalvik.system.NativeStart.main(Native Method)
09-09 16:55:37.041: E/AndroidRuntime(906): Caused by: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView
09-09 16:55:37.041: E/AndroidRuntime(906): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:379)
09-09 16:55:37.041: E/AndroidRuntime(906): ... 42 more
答案 0 :(得分：0)
setListAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, friends));
到
setListAdapter(new ArrayAdapter<String>(this,R.layout.simple_list_item_1**,R.id.textView1**, friends));
listView = getListView();
//感谢@ T-Rush寻求支持