Fatal error: main. editText equals for login in android studio
I'm just learning some basics of Java and have little problem with my app
This is part of my MainActivity
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton button = (FloatingActionButton) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
EditText edit = (EditText) findViewById(R.id.editText);
if (edit.getText().toString().equals("admin")) {
Intent gz = new Intent(getApplicationContext(), gz.class);
startActivity(gz);
}
}
});
}
I would like that app changed activity from mainActivity to gz activity after click button and check EditText edit.
At this stage app just crash.
--------- beginning of crash 08-16 12:50:38.284 9345-9345/com.example.fiery.app1 E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.fiery.app1, PID: 9345 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fiery.app1/com.example.fiery.app1.MainActivity}: java.lang.ClassCastException: android.support.v7.widget.AppCompatButton cannot be cast to android.support.design.widget.FloatingActionButton at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2434) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494) at android.app.ActivityThread.access$900(ActivityThread.java:157) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1356) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5551) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(Zy goteInit.java:730) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620) Caused by: java.lang.ClassCastException: android.support.v7.widget.AppCompatButton cannot be cast to android.support.design.widget.FloatingActionButton at com.example.fiery.app1.MainActivity.onCreate(MainActivity.java:25) at android.app.Activity.performCreate(Activity.java:6272) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2387) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494) at android.app.ActivityThread.access$900(ActivityThread.java:157) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1356) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5551) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCall er.run(ZygoteInit.java:730) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
你是错误的方式初始化你的按钮，你可以尝试将你的小部件按钮投到FloatingActionButtonyou，这是不可能的，请改变像这样
Button button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
EditText edit = (EditText) findViewById(R.id.editText);
if (edit.getText().toString().equals("admin")) {
Intent gz = new Intent(getApplicationContext(), gz.class);
startActivity(gz);
}
}
});
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