问题
First I am trying this way. And I am stuck then I ask question But no one gives any answer. Then I try another way suggested by @sayed.jalil in this link. But my app stop working. If someone provide answer for first link Really appriciated. And if someone like to answer the alternative I've tried according to @sayed.jalil answer. For that my code below-
Xml code-
<com.info.abc.JustifiedTextView
android:id="@+id/textview1"
android:textColor="#FFFFFF"/>
Activity code-
JustifiedTextView txtViewEx = (JustifiedTextView) findViewById(R.id.textview1);
txtViewEx.setText("some text");
JustifiedTextView.java -
import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Color;
import android.text.SpannableString;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
public class JustifiedTextView extends WebView {
private String core = "<html><body style='text-align:justify;color:rgba(%s);font-size:%dpx;margin: 10px 10px 10px 10px;'>%s</body></html>";
private String textColor = "0,0,0,255";
private String text = "";
private int textSize = 12;
private int backgroundColor = Color.TRANSPARENT;
public JustifiedTextView(Context context) {
super(context);
this.setWebChromeClient(new WebChromeClient() {
});
}
public void setText(String s) {
this.text = s;
// this.setPadding(10, 10, 10, 10);
reloadData();
}
@SuppressLint("NewApi")
private void reloadData() {
// loadData(...) has a bug showing utf-8 correctly. That's why we need
// to set it first.
this.getSettings().setDefaultTextEncodingName("utf-8");
this.loadData(String.format(core, textColor, textSize, text),
"text/html", "utf-8");
// set WebView's background color *after* data was loaded.
super.setBackgroundColor(backgroundColor);
// Hardware rendering breaks background color to work as expected.
// Need to use software renderer in that case.
if (android.os.Build.VERSION.SDK_INT >= 11)
this.setLayerType(WebView.LAYER_TYPE_SOFTWARE, null);
}
public void setTextColor(int hex) {
String h = Integer.toHexString(hex);
int a = Integer.parseInt(h.substring(0, 2), 16);
int r = Integer.parseInt(h.substring(2, 4), 16);
int g = Integer.parseInt(h.substring(4, 6), 16);
int b = Integer.parseInt(h.substring(6, 8), 16);
textColor = String.format("%d,%d,%d,%d", r, g, b, a);
reloadData();
}
public void setBackgroundColor(int hex) {
backgroundColor = hex;
reloadData();
}
public void setTextSize(int textSize) {
this.textSize = textSize;
reloadData();
}
}
Logcat-
01-19 10:43:19.400: E/AndroidRuntime(1482): FATAL EXCEPTION: main
01-19 10:43:19.400: E/AndroidRuntime(1482): Process: com.info.abc, PID: 1482
01-19 10:43:19.400: E/AndroidRuntime(1482): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.info.abc/com.info.abc.History}:
android.view.InflateException: Binary XML file line #24: Error inflating class com.info.abc.JustifiedTextView
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2176)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.app.ActivityThread.access$700(ActivityThread.java:135)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.os.Handler.dispatchMessage(Handler.java:102)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.os.Looper.loop(Looper.java:137)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.app.ActivityThread.main(ActivityThread.java:4998)
01-19 10:43:19.400: E/AndroidRuntime(1482): at java.lang.reflect.Method.invokeNative(Native Method)
01-19 10:43:19.400: E/AndroidRuntime(1482): at java.lang.reflect.Method.invoke(Method.java:515)
01-19 10:43:19.400: E/AndroidRuntime(1482): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
01-19 10:43:19.400: E/AndroidRuntime(1482): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
01-19 10:43:19.400: E/AndroidRuntime(1482): at dalvik.system.NativeStart.main(Native Method)
01-19 10:43:19.400: E/AndroidRuntime(1482): Caused by: android.view.InflateException: Binary XML file line #24: Error inflating class com.info.abc.JustifiedTextView
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.view.LayoutInflater.createView(LayoutInflater.java:603)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
01-19 10:43:19.400: E/AndroidRuntime(1482): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:290)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.app.Activity.setContentView(Activity.java:1928)
01-19 10:43:19.400: E/AndroidRuntime(1482): at com.info.abc.History.onCreate(History.java:19)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.app.Activity.performCreate(Activity.java:5243)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
01-19 10:43:19.400: E/AndroidRuntime(1482): ... 11 more
01-19 10:43:19.400: E/AndroidRuntime(1482): Caused by: java.lang.NoSuchMethodException: <init> [class android.content.Context, interface android.util.AttributeSet]
01-19 10:43:19.400: E/AndroidRuntime(1482): at java.lang.Class.getConstructorOrMethod(Class.java:472)
01-19 10:43:19.400: E/AndroidRuntime(1482): at java.lang.Class.getConstructor(Class.java:446)
01-19 10:43:19.400: E/AndroidRuntime(1482): at android.view.LayoutInflater.createView(LayoutInflater.java:568)
01-19 10:43:19.400: E/AndroidRuntime(1482): ... 23 more
回答1:
Caused by: java.lang.NoSuchMethodException:
<init> [class android.content.Context, interface android.util.AttributeSet]
01-19 10:43:19.400: E/AndroidRuntime(1482):
at java.lang.Class.getConstructorOrMethod(Class.java:472)
You are not providing all of the constructors required for a custom view.
Specifically, add this constructor. Read the documentation and tutorials for how to use the attribute set:
public JustifiedTextView(Context context, AttributeSet attrs){
super(context, attrs);
this.setWebChromeClient(new WebChromeClient() {
});
}
来源：https://stackoverflow.com/questions/21219163/app-stop-working