更新：我用你给我的代码替换了我的代码，但我遇到了运行时错误。澄清;我有两个TextView，每个都有自己的Id，但里面没有文字。我还有两个声明的字符串（每个TextView一个），每个字符串都有我想要的内容。代码接受这些字符串并将它们放入我的TextViews中，然后按照我设置速度的速率一次打印一个字母的字符串。
这是我目前的MainActivity.java类：
cell.imgView.userInteractionEnabled = YES;
更新：这是我的LetterDisplay类：
package com.example.micor.projectsero2;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import com.example.micor.projectsero2.util.LetterDisplay;
public class MainActivity extends Activity {
public void onCreate(Bundle savedInstanceState){
// ...
// you can do this in every method not only in onCreate e.g onStart onResume etc.
// now start LetterDisplay thread
TextView textView = (TextView) findViewById(R.id.loadView); // if you have another id of textView replace R.id.textView to your id
String text = getString(R.string.loadText);
int speed = 30; // you can change it to another value
LetterDisplay letterDisplay = new LetterDisplay(this, textView, text, speed);
letterDisplay.start(); // now LetterDisplay thread is running
// EDIT: and start next LetterDisplay thread for second textView
String secondText = getString(R.string.prelogText);
TextView secondTextView = (TextView) findViewById(R.id.prelogView); // replace R.id.second_text_view with your id of second textView
letterDisplay = new LetterDisplay(this, secondTextView, secondText, speed);
letterDisplay.start();
// and now two threads is running and updates textViews
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
运行Logcat：
public class LetterDisplay extends Thread {
private Activity mActivity;
private TextView textView;
private String text;
private int charCount;
private int currentLetterCount = 0;
private int speed; // How fast should it type?
private boolean isRunning = true;
public LetterDisplay(Activity activity, TextView textView, String text, int speed){
mActivity = activity;
this.textView = textView;
this.text = text;
this.speed = speed;
}
public void run(){
while(currentLetterCount < charCount && isRunning){
String currentText = textView.getText().toString();
char currentLetter = text.charAt(currentLetterCount++);
final String textToUpdate = currentText + currentLetter;
mActivity.runOnUiThread(new Runnable(){
public void run(){
textView.setText(textToUpdate);
}
});
try
{
Thread.sleep(speed);
} catch(InterruptedException e){}
}
isRunning = false;
}
public void stopThread(){
isRunning = false;
}
public boolean isRunning(){
return isRunning;
}
}
07-05 12：40：08.348 3308-3329 /？ D / KeyguardUpdateMonitor：isSimPinSecure（）返回false 07-05 12：40：08.348 1079-3332 /？ W / ActivityManager：强制完成活动1 com.example.micor.projectsero2 / .MainActivity 07-05 12：40：08.358 3308-4541 /？ D / KeyguardUpdateMonitor：isSimPinSecure（）返回false
答案 0 :(得分：3)
您要获取的类型不是String类型，因此您应该添加“toString”方法。另外，“getText”方法不适用于参数，因此它应该是：
String currentText = loadView.getText().toString();
答案 1 :(得分：2)
试试这个
String currentText = loadView.getText().toString();
方法getText（）不接受任何参数并返回CharSequence。 CharSequence不能分配给String，你必须调用toString（）方法。
编辑：FIXED LetterDisplay类：
public LetterDisplay(Activity activity, TextView textView, String text, int speed){
mActivity = activity;
if(mActivity == null){
throw new IllegalArgumentException("activity cannot be null in LetterDisplay");
}
this.textView = textView;
if(textView == null){
throw new IllegalArgumentException("textView cannot be null in LetterDisplay");
}
this.text = text;
if(text == null){
throw new IllegalArgumentException("text cannot be null in LetterDisplay");
}
this.speed = speed;
if(speed <= 0){
throw new IllegalArgumentException("speed cannot be lower or equals than 0");
}
this.charCount = text.length();
if(charCount == 0){
// no error but i print the warning into logcat
Log.w("LetterDisplay", "The text in the LetterDisplay is empty and nothing will be executed");
}
}
public void run(){
if(charCount > 0)
textView.setText(""); // Clear the text if any exists
while(currentLetterCount < charCount && isRunning){
final String textToUpdate = text.substring(0, ++currentLetterCount);
mActivity.runOnUiThread(new Runnable(){
public void run(){
textView.setText(textToUpdate);
}
});
try
{
Thread.sleep(speed);
} catch(InterruptedException e){}
}
isRunning = false;
}
public void stopThread(){
// you can call it in onPause or onStop or in onDestroy method to stop the thread and avoid energy consumption
isRunning = false;
}
public boolean isRunning(){
// if you want to check if thread is running
return isRunning;
}
}
现在在您的活动中：
public class MyActivity extends Activity {
public void onCreate(Bundle savedInstanceState){
// ...
// you can do this in every method not only in onCreate e.g onStart onResume etc.
// now start LetterDisplay thread
TextView textView = (TextView) findViewById(R.id.textView); // if you have another id of textView replace R.id.textView to your id
String text = "Text to show. You can change it";
int speed = 100; // you can change it to another value
LetterDisplay letterDisplay = new LetterDisplay(this, textView, text, speed);
letterDisplay.start(); // now LetterDisplay thread is running
// EDIT: and start next LetterDisplay thread for second textView
String secondText = "Second text to show";
TextView secondTextView = (TextView) findViewById(R.id.second_text_view); // replace R.id.second_text_view with your id of second textView
letterDisplay = new LetterDisplay(this, secondTextView, secondText, speed);
letterDisplay.start();
// and now two threads is running and updates textViews
}
}